Fix race in pthread_mutex_lock while promoting to PTHREAD_MUTEX_ELISION_NP [BZ #23275]
The race leads either to pthread_mutex_destroy returning EBUSY or triggering an assertion (See description in bugzilla). This patch is fixing the race by ensuring that the elision path is used in all cases if elision is enabled by the GLIBC_TUNABLES framework. The __kind variable in struct __pthread_mutex_s is accessed concurrently. Therefore we are now using the atomic macros. The new testcase tst-mutex10 is triggering the race on s390x and intel. Presumably also on power, but I don't have access to a power machine with lock-elision. At least the code for power is the same as on the other two architectures. ChangeLog: [BZ #23275] * nptl/tst-mutex10.c: New File. * nptl/Makefile (tests): Add tst-mutex10. (tst-mutex10-ENV): New variable. * sysdeps/unix/sysv/linux/s390/force-elision.h: (FORCE_ELISION): Ensure that elision path is used if elision is available. * sysdeps/unix/sysv/linux/powerpc/force-elision.h (FORCE_ELISION): Likewise. * sysdeps/unix/sysv/linux/x86/force-elision.h: (FORCE_ELISION): Likewise. * nptl/pthreadP.h (PTHREAD_MUTEX_TYPE, PTHREAD_MUTEX_TYPE_ELISION) (PTHREAD_MUTEX_PSHARED): Use atomic_load_relaxed. * nptl/pthread_mutex_consistent.c (pthread_mutex_consistent): Likewise. * nptl/pthread_mutex_getprioceiling.c (pthread_mutex_getprioceiling): Likewise. * nptl/pthread_mutex_lock.c (__pthread_mutex_lock_full) (__pthread_mutex_cond_lock_adjust): Likewise. * nptl/pthread_mutex_setprioceiling.c (pthread_mutex_setprioceiling): Likewise. * nptl/pthread_mutex_timedlock.c (__pthread_mutex_timedlock): Likewise. * nptl/pthread_mutex_trylock.c (__pthread_mutex_trylock): Likewise. * nptl/pthread_mutex_unlock.c (__pthread_mutex_unlock_full): Likewise. * sysdeps/nptl/bits/thread-shared-types.h (struct __pthread_mutex_s): Add comments. * nptl/pthread_mutex_destroy.c (__pthread_mutex_destroy): Use atomic_load_relaxed and atomic_store_relaxed. * nptl/pthread_mutex_init.c (__pthread_mutex_init): Use atomic_store_relaxed.
This commit is contained in:
Stefan Liebler
parent
ce5a7de6cd
commit
403b4feb22
31
ChangeLog
31
ChangeLog
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@ -1,3 +1,34 @@
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2018-10-17 Stefan Liebler <stli@linux.ibm.com>
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[BZ #23275]
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* nptl/tst-mutex10.c: New File.
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* nptl/Makefile (tests): Add tst-mutex10.
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(tst-mutex10-ENV): New variable.
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* sysdeps/unix/sysv/linux/s390/force-elision.h: (FORCE_ELISION):
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Ensure that elision path is used if elision is available.
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* sysdeps/unix/sysv/linux/powerpc/force-elision.h (FORCE_ELISION):
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Likewise.
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* sysdeps/unix/sysv/linux/x86/force-elision.h: (FORCE_ELISION):
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Likewise.
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* nptl/pthreadP.h (PTHREAD_MUTEX_TYPE, PTHREAD_MUTEX_TYPE_ELISION)
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(PTHREAD_MUTEX_PSHARED): Use atomic_load_relaxed.
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* nptl/pthread_mutex_consistent.c (pthread_mutex_consistent): Likewise.
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* nptl/pthread_mutex_getprioceiling.c (pthread_mutex_getprioceiling):
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Likewise.
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* nptl/pthread_mutex_lock.c (__pthread_mutex_lock_full)
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(__pthread_mutex_cond_lock_adjust): Likewise.
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* nptl/pthread_mutex_setprioceiling.c (pthread_mutex_setprioceiling):
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Likewise.
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* nptl/pthread_mutex_timedlock.c (__pthread_mutex_timedlock): Likewise.
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* nptl/pthread_mutex_trylock.c (__pthread_mutex_trylock): Likewise.
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* nptl/pthread_mutex_unlock.c (__pthread_mutex_unlock_full): Likewise.
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* sysdeps/nptl/bits/thread-shared-types.h (struct __pthread_mutex_s):
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Add comments.
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* nptl/pthread_mutex_destroy.c (__pthread_mutex_destroy):
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Use atomic_load_relaxed and atomic_store_relaxed.
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* nptl/pthread_mutex_init.c (__pthread_mutex_init):
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Use atomic_store_relaxed.
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2018-10-17 Andreas Schwab <schwab@suse.de>
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* benchtests/bench-strtod.c (TIMEOUT): Don't define.
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@ -241,9 +241,9 @@ LDLIBS-tst-minstack-throw = -lstdc++
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tests = tst-attr1 tst-attr2 tst-attr3 tst-default-attr \
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tst-mutex1 tst-mutex2 tst-mutex3 tst-mutex4 tst-mutex5 tst-mutex6 \
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tst-mutex7 tst-mutex9 tst-mutex5a tst-mutex7a tst-mutex7robust \
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tst-mutexpi1 tst-mutexpi2 tst-mutexpi3 tst-mutexpi4 tst-mutexpi5 \
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tst-mutexpi5a tst-mutexpi6 tst-mutexpi7 tst-mutexpi7a \
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tst-mutex7 tst-mutex9 tst-mutex10 tst-mutex5a tst-mutex7a \
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tst-mutex7robust tst-mutexpi1 tst-mutexpi2 tst-mutexpi3 tst-mutexpi4 \
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tst-mutexpi5 tst-mutexpi5a tst-mutexpi6 tst-mutexpi7 tst-mutexpi7a \
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tst-mutexpi9 \
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tst-spin1 tst-spin2 tst-spin3 tst-spin4 \
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tst-cond1 tst-cond2 tst-cond3 tst-cond4 tst-cond5 tst-cond6 tst-cond7 \
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@ -709,6 +709,8 @@ endif
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$(objpfx)tst-compat-forwarder: $(objpfx)tst-compat-forwarder-mod.so
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tst-mutex10-ENV = GLIBC_TUNABLES=glibc.elision.enable=1
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# The tests here better do not run in parallel
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ifneq ($(filter %tests,$(MAKECMDGOALS)),)
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.NOTPARALLEL:
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@ -110,19 +110,23 @@ enum
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};
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#define PTHREAD_MUTEX_PSHARED_BIT 128
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/* See concurrency notes regarding __kind in struct __pthread_mutex_s
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in sysdeps/nptl/bits/thread-shared-types.h. */
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#define PTHREAD_MUTEX_TYPE(m) \
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((m)->__data.__kind & 127)
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(atomic_load_relaxed (&((m)->__data.__kind)) & 127)
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/* Don't include NO_ELISION, as that type is always the same
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as the underlying lock type. */
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#define PTHREAD_MUTEX_TYPE_ELISION(m) \
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((m)->__data.__kind & (127|PTHREAD_MUTEX_ELISION_NP))
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(atomic_load_relaxed (&((m)->__data.__kind)) \
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& (127 | PTHREAD_MUTEX_ELISION_NP))
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#if LLL_PRIVATE == 0 && LLL_SHARED == 128
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# define PTHREAD_MUTEX_PSHARED(m) \
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((m)->__data.__kind & 128)
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(atomic_load_relaxed (&((m)->__data.__kind)) & 128)
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#else
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# define PTHREAD_MUTEX_PSHARED(m) \
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(((m)->__data.__kind & 128) ? LLL_SHARED : LLL_PRIVATE)
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((atomic_load_relaxed (&((m)->__data.__kind)) & 128) \
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? LLL_SHARED : LLL_PRIVATE)
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#endif
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/* The kernel when waking robust mutexes on exit never uses
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@ -23,8 +23,11 @@
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int
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pthread_mutex_consistent (pthread_mutex_t *mutex)
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{
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/* Test whether this is a robust mutex with a dead owner. */
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if ((mutex->__data.__kind & PTHREAD_MUTEX_ROBUST_NORMAL_NP) == 0
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/* Test whether this is a robust mutex with a dead owner.
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See concurrency notes regarding __kind in struct __pthread_mutex_s
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in sysdeps/nptl/bits/thread-shared-types.h. */
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if ((atomic_load_relaxed (&(mutex->__data.__kind))
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& PTHREAD_MUTEX_ROBUST_NORMAL_NP) == 0
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|| mutex->__data.__owner != PTHREAD_MUTEX_INCONSISTENT)
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return EINVAL;
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@ -27,12 +27,17 @@ __pthread_mutex_destroy (pthread_mutex_t *mutex)
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{
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LIBC_PROBE (mutex_destroy, 1, mutex);
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if ((mutex->__data.__kind & PTHREAD_MUTEX_ROBUST_NORMAL_NP) == 0
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/* See concurrency notes regarding __kind in struct __pthread_mutex_s
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in sysdeps/nptl/bits/thread-shared-types.h. */
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if ((atomic_load_relaxed (&(mutex->__data.__kind))
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& PTHREAD_MUTEX_ROBUST_NORMAL_NP) == 0
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&& mutex->__data.__nusers != 0)
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return EBUSY;
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/* Set to an invalid value. */
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mutex->__data.__kind = -1;
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/* Set to an invalid value. Relaxed MO is enough as it is undefined behavior
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if the mutex is used after it has been destroyed. But you can reinitialize
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it with pthread_mutex_init. */
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atomic_store_relaxed (&(mutex->__data.__kind), -1);
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return 0;
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}
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@ -24,7 +24,9 @@
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int
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pthread_mutex_getprioceiling (const pthread_mutex_t *mutex, int *prioceiling)
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{
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if (__builtin_expect ((mutex->__data.__kind
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/* See concurrency notes regarding __kind in struct __pthread_mutex_s
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in sysdeps/nptl/bits/thread-shared-types.h. */
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if (__builtin_expect ((atomic_load_relaxed (&(mutex->__data.__kind))
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& PTHREAD_MUTEX_PRIO_PROTECT_NP) == 0, 0))
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return EINVAL;
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@ -101,7 +101,7 @@ __pthread_mutex_init (pthread_mutex_t *mutex,
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memset (mutex, '\0', __SIZEOF_PTHREAD_MUTEX_T);
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/* Copy the values from the attribute. */
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mutex->__data.__kind = imutexattr->mutexkind & ~PTHREAD_MUTEXATTR_FLAG_BITS;
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int mutex_kind = imutexattr->mutexkind & ~PTHREAD_MUTEXATTR_FLAG_BITS;
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if ((imutexattr->mutexkind & PTHREAD_MUTEXATTR_FLAG_ROBUST) != 0)
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{
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@ -111,17 +111,17 @@ __pthread_mutex_init (pthread_mutex_t *mutex,
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return ENOTSUP;
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#endif
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mutex->__data.__kind |= PTHREAD_MUTEX_ROBUST_NORMAL_NP;
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mutex_kind |= PTHREAD_MUTEX_ROBUST_NORMAL_NP;
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}
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switch (imutexattr->mutexkind & PTHREAD_MUTEXATTR_PROTOCOL_MASK)
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{
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case PTHREAD_PRIO_INHERIT << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT:
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mutex->__data.__kind |= PTHREAD_MUTEX_PRIO_INHERIT_NP;
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mutex_kind |= PTHREAD_MUTEX_PRIO_INHERIT_NP;
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break;
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case PTHREAD_PRIO_PROTECT << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT:
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mutex->__data.__kind |= PTHREAD_MUTEX_PRIO_PROTECT_NP;
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mutex_kind |= PTHREAD_MUTEX_PRIO_PROTECT_NP;
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int ceiling = (imutexattr->mutexkind
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& PTHREAD_MUTEXATTR_PRIO_CEILING_MASK)
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@ -145,7 +145,11 @@ __pthread_mutex_init (pthread_mutex_t *mutex,
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FUTEX_PRIVATE_FLAG FUTEX_WAKE. */
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if ((imutexattr->mutexkind & (PTHREAD_MUTEXATTR_FLAG_PSHARED
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| PTHREAD_MUTEXATTR_FLAG_ROBUST)) != 0)
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mutex->__data.__kind |= PTHREAD_MUTEX_PSHARED_BIT;
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mutex_kind |= PTHREAD_MUTEX_PSHARED_BIT;
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/* See concurrency notes regarding __kind in struct __pthread_mutex_s
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in sysdeps/nptl/bits/thread-shared-types.h. */
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atomic_store_relaxed (&(mutex->__data.__kind), mutex_kind);
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/* Default values: mutex not used yet. */
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// mutex->__count = 0; already done by memset
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@ -62,6 +62,8 @@ static int __pthread_mutex_lock_full (pthread_mutex_t *mutex)
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int
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__pthread_mutex_lock (pthread_mutex_t *mutex)
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{
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/* See concurrency notes regarding mutex type which is loaded from __kind
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in struct __pthread_mutex_s in sysdeps/nptl/bits/thread-shared-types.h. */
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unsigned int type = PTHREAD_MUTEX_TYPE_ELISION (mutex);
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LIBC_PROBE (mutex_entry, 1, mutex);
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@ -350,8 +352,14 @@ __pthread_mutex_lock_full (pthread_mutex_t *mutex)
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case PTHREAD_MUTEX_PI_ROBUST_NORMAL_NP:
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case PTHREAD_MUTEX_PI_ROBUST_ADAPTIVE_NP:
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{
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int kind = mutex->__data.__kind & PTHREAD_MUTEX_KIND_MASK_NP;
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int robust = mutex->__data.__kind & PTHREAD_MUTEX_ROBUST_NORMAL_NP;
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int kind, robust;
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{
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/* See concurrency notes regarding __kind in struct __pthread_mutex_s
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in sysdeps/nptl/bits/thread-shared-types.h. */
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int mutex_kind = atomic_load_relaxed (&(mutex->__data.__kind));
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kind = mutex_kind & PTHREAD_MUTEX_KIND_MASK_NP;
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robust = mutex_kind & PTHREAD_MUTEX_ROBUST_NORMAL_NP;
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}
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if (robust)
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{
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@ -502,7 +510,10 @@ __pthread_mutex_lock_full (pthread_mutex_t *mutex)
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case PTHREAD_MUTEX_PP_NORMAL_NP:
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case PTHREAD_MUTEX_PP_ADAPTIVE_NP:
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{
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int kind = mutex->__data.__kind & PTHREAD_MUTEX_KIND_MASK_NP;
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/* See concurrency notes regarding __kind in struct __pthread_mutex_s
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in sysdeps/nptl/bits/thread-shared-types.h. */
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int kind = atomic_load_relaxed (&(mutex->__data.__kind))
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& PTHREAD_MUTEX_KIND_MASK_NP;
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oldval = mutex->__data.__lock;
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@ -607,15 +618,18 @@ hidden_def (__pthread_mutex_lock)
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void
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__pthread_mutex_cond_lock_adjust (pthread_mutex_t *mutex)
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{
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assert ((mutex->__data.__kind & PTHREAD_MUTEX_PRIO_INHERIT_NP) != 0);
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assert ((mutex->__data.__kind & PTHREAD_MUTEX_ROBUST_NORMAL_NP) == 0);
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assert ((mutex->__data.__kind & PTHREAD_MUTEX_PSHARED_BIT) == 0);
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/* See concurrency notes regarding __kind in struct __pthread_mutex_s
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in sysdeps/nptl/bits/thread-shared-types.h. */
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int mutex_kind = atomic_load_relaxed (&(mutex->__data.__kind));
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assert ((mutex_kind & PTHREAD_MUTEX_PRIO_INHERIT_NP) != 0);
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assert ((mutex_kind & PTHREAD_MUTEX_ROBUST_NORMAL_NP) == 0);
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assert ((mutex_kind & PTHREAD_MUTEX_PSHARED_BIT) == 0);
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/* Record the ownership. */
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pid_t id = THREAD_GETMEM (THREAD_SELF, tid);
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mutex->__data.__owner = id;
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if (mutex->__data.__kind == PTHREAD_MUTEX_PI_RECURSIVE_NP)
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if (mutex_kind == PTHREAD_MUTEX_PI_RECURSIVE_NP)
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++mutex->__data.__count;
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}
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#endif
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@ -27,9 +27,10 @@ int
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pthread_mutex_setprioceiling (pthread_mutex_t *mutex, int prioceiling,
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int *old_ceiling)
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{
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/* The low bits of __kind aren't ever changed after pthread_mutex_init,
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so we don't need a lock yet. */
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if ((mutex->__data.__kind & PTHREAD_MUTEX_PRIO_PROTECT_NP) == 0)
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/* See concurrency notes regarding __kind in struct __pthread_mutex_s
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in sysdeps/nptl/bits/thread-shared-types.h. */
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if ((atomic_load_relaxed (&(mutex->__data.__kind))
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& PTHREAD_MUTEX_PRIO_PROTECT_NP) == 0)
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return EINVAL;
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/* See __init_sched_fifo_prio. */
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@ -53,6 +53,8 @@ __pthread_mutex_timedlock (pthread_mutex_t *mutex,
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/* We must not check ABSTIME here. If the thread does not block
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abstime must not be checked for a valid value. */
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/* See concurrency notes regarding mutex type which is loaded from __kind
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in struct __pthread_mutex_s in sysdeps/nptl/bits/thread-shared-types.h. */
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switch (__builtin_expect (PTHREAD_MUTEX_TYPE_ELISION (mutex),
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PTHREAD_MUTEX_TIMED_NP))
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{
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@ -338,8 +340,14 @@ __pthread_mutex_timedlock (pthread_mutex_t *mutex,
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case PTHREAD_MUTEX_PI_ROBUST_NORMAL_NP:
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case PTHREAD_MUTEX_PI_ROBUST_ADAPTIVE_NP:
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{
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int kind = mutex->__data.__kind & PTHREAD_MUTEX_KIND_MASK_NP;
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int robust = mutex->__data.__kind & PTHREAD_MUTEX_ROBUST_NORMAL_NP;
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int kind, robust;
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{
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/* See concurrency notes regarding __kind in struct __pthread_mutex_s
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in sysdeps/nptl/bits/thread-shared-types.h. */
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int mutex_kind = atomic_load_relaxed (&(mutex->__data.__kind));
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kind = mutex_kind & PTHREAD_MUTEX_KIND_MASK_NP;
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robust = mutex_kind & PTHREAD_MUTEX_ROBUST_NORMAL_NP;
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}
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if (robust)
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{
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@ -509,7 +517,10 @@ __pthread_mutex_timedlock (pthread_mutex_t *mutex,
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case PTHREAD_MUTEX_PP_NORMAL_NP:
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case PTHREAD_MUTEX_PP_ADAPTIVE_NP:
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{
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int kind = mutex->__data.__kind & PTHREAD_MUTEX_KIND_MASK_NP;
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/* See concurrency notes regarding __kind in struct __pthread_mutex_s
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in sysdeps/nptl/bits/thread-shared-types.h. */
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int kind = atomic_load_relaxed (&(mutex->__data.__kind))
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& PTHREAD_MUTEX_KIND_MASK_NP;
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oldval = mutex->__data.__lock;
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@ -36,6 +36,8 @@ __pthread_mutex_trylock (pthread_mutex_t *mutex)
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int oldval;
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pid_t id = THREAD_GETMEM (THREAD_SELF, tid);
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/* See concurrency notes regarding mutex type which is loaded from __kind
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in struct __pthread_mutex_s in sysdeps/nptl/bits/thread-shared-types.h. */
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switch (__builtin_expect (PTHREAD_MUTEX_TYPE_ELISION (mutex),
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PTHREAD_MUTEX_TIMED_NP))
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{
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@ -199,8 +201,14 @@ __pthread_mutex_trylock (pthread_mutex_t *mutex)
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case PTHREAD_MUTEX_PI_ROBUST_NORMAL_NP:
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case PTHREAD_MUTEX_PI_ROBUST_ADAPTIVE_NP:
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{
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int kind = mutex->__data.__kind & PTHREAD_MUTEX_KIND_MASK_NP;
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int robust = mutex->__data.__kind & PTHREAD_MUTEX_ROBUST_NORMAL_NP;
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int kind, robust;
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{
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/* See concurrency notes regarding __kind in struct __pthread_mutex_s
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in sysdeps/nptl/bits/thread-shared-types.h. */
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int mutex_kind = atomic_load_relaxed (&(mutex->__data.__kind));
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kind = mutex_kind & PTHREAD_MUTEX_KIND_MASK_NP;
|
||||
robust = mutex_kind & PTHREAD_MUTEX_ROBUST_NORMAL_NP;
|
||||
}
|
||||
|
||||
if (robust)
|
||||
/* Note: robust PI futexes are signaled by setting bit 0. */
|
||||
|
|
@ -325,7 +333,10 @@ __pthread_mutex_trylock (pthread_mutex_t *mutex)
|
|||
case PTHREAD_MUTEX_PP_NORMAL_NP:
|
||||
case PTHREAD_MUTEX_PP_ADAPTIVE_NP:
|
||||
{
|
||||
int kind = mutex->__data.__kind & PTHREAD_MUTEX_KIND_MASK_NP;
|
||||
/* See concurrency notes regarding __kind in struct __pthread_mutex_s
|
||||
in sysdeps/nptl/bits/thread-shared-types.h. */
|
||||
int kind = atomic_load_relaxed (&(mutex->__data.__kind))
|
||||
& PTHREAD_MUTEX_KIND_MASK_NP;
|
||||
|
||||
oldval = mutex->__data.__lock;
|
||||
|
||||
|
|
|
|||
|
|
@ -35,6 +35,8 @@ int
|
|||
attribute_hidden
|
||||
__pthread_mutex_unlock_usercnt (pthread_mutex_t *mutex, int decr)
|
||||
{
|
||||
/* See concurrency notes regarding mutex type which is loaded from __kind
|
||||
in struct __pthread_mutex_s in sysdeps/nptl/bits/thread-shared-types.h. */
|
||||
int type = PTHREAD_MUTEX_TYPE_ELISION (mutex);
|
||||
if (__builtin_expect (type &
|
||||
~(PTHREAD_MUTEX_KIND_MASK_NP|PTHREAD_MUTEX_ELISION_FLAGS_NP), 0))
|
||||
|
|
@ -222,13 +224,19 @@ __pthread_mutex_unlock_full (pthread_mutex_t *mutex, int decr)
|
|||
/* If the previous owner died and the caller did not succeed in
|
||||
making the state consistent, mark the mutex as unrecoverable
|
||||
and make all waiters. */
|
||||
if ((mutex->__data.__kind & PTHREAD_MUTEX_ROBUST_NORMAL_NP) != 0
|
||||
/* See concurrency notes regarding __kind in struct __pthread_mutex_s
|
||||
in sysdeps/nptl/bits/thread-shared-types.h. */
|
||||
if ((atomic_load_relaxed (&(mutex->__data.__kind))
|
||||
& PTHREAD_MUTEX_ROBUST_NORMAL_NP) != 0
|
||||
&& __builtin_expect (mutex->__data.__owner
|
||||
== PTHREAD_MUTEX_INCONSISTENT, 0))
|
||||
pi_notrecoverable:
|
||||
newowner = PTHREAD_MUTEX_NOTRECOVERABLE;
|
||||
|
||||
if ((mutex->__data.__kind & PTHREAD_MUTEX_ROBUST_NORMAL_NP) != 0)
|
||||
/* See concurrency notes regarding __kind in struct __pthread_mutex_s
|
||||
in sysdeps/nptl/bits/thread-shared-types.h. */
|
||||
if ((atomic_load_relaxed (&(mutex->__data.__kind))
|
||||
& PTHREAD_MUTEX_ROBUST_NORMAL_NP) != 0)
|
||||
{
|
||||
continue_pi_robust:
|
||||
/* Remove mutex from the list.
|
||||
|
|
@ -251,7 +259,10 @@ __pthread_mutex_unlock_full (pthread_mutex_t *mutex, int decr)
|
|||
/* Unlock. Load all necessary mutex data before releasing the mutex
|
||||
to not violate the mutex destruction requirements (see
|
||||
lll_unlock). */
|
||||
int robust = mutex->__data.__kind & PTHREAD_MUTEX_ROBUST_NORMAL_NP;
|
||||
/* See concurrency notes regarding __kind in struct __pthread_mutex_s
|
||||
in sysdeps/nptl/bits/thread-shared-types.h. */
|
||||
int robust = atomic_load_relaxed (&(mutex->__data.__kind))
|
||||
& PTHREAD_MUTEX_ROBUST_NORMAL_NP;
|
||||
private = (robust
|
||||
? PTHREAD_ROBUST_MUTEX_PSHARED (mutex)
|
||||
: PTHREAD_MUTEX_PSHARED (mutex));
|
||||
|
|
|
|||
109
nptl/tst-mutex10.c
Normal file
109
nptl/tst-mutex10.c
Normal file
|
|
@ -0,0 +1,109 @@
|
|||
/* Testing race while enabling lock elision.
|
||||
Copyright (C) 2018 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 of the License, or (at your option) any later version.
|
||||
|
||||
The GNU C Library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with the GNU C Library; if not, see
|
||||
<http://www.gnu.org/licenses/>. */
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <stdint.h>
|
||||
#include <pthread.h>
|
||||
#include <unistd.h>
|
||||
#include <getopt.h>
|
||||
#include <support/support.h>
|
||||
#include <support/xthread.h>
|
||||
|
||||
static pthread_barrier_t barrier;
|
||||
static pthread_mutex_t mutex;
|
||||
static long long int iteration_count = 1000000;
|
||||
static unsigned int thread_count = 3;
|
||||
|
||||
static void *
|
||||
thr_func (void *arg)
|
||||
{
|
||||
long long int i;
|
||||
for (i = 0; i < iteration_count; i++)
|
||||
{
|
||||
if ((uintptr_t) arg == 0)
|
||||
{
|
||||
xpthread_mutex_destroy (&mutex);
|
||||
xpthread_mutex_init (&mutex, NULL);
|
||||
}
|
||||
|
||||
xpthread_barrier_wait (&barrier);
|
||||
|
||||
/* Test if enabling lock elision works if it is enabled concurrently.
|
||||
There was a race in FORCE_ELISION macro which leads to either
|
||||
pthread_mutex_destroy returning EBUSY as the owner was recorded
|
||||
by pthread_mutex_lock - in "normal mutex" code path - but was not
|
||||
resetted in pthread_mutex_unlock - in "elision" code path.
|
||||
Or it leads to the assertion in nptl/pthread_mutex_lock.c:
|
||||
assert (mutex->__data.__owner == 0);
|
||||
Please ensure that the test is run with lock elision:
|
||||
export GLIBC_TUNABLES=glibc.elision.enable=1 */
|
||||
xpthread_mutex_lock (&mutex);
|
||||
xpthread_mutex_unlock (&mutex);
|
||||
|
||||
xpthread_barrier_wait (&barrier);
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static int
|
||||
do_test (void)
|
||||
{
|
||||
unsigned int i;
|
||||
printf ("Starting %d threads to run %lld iterations.\n",
|
||||
thread_count, iteration_count);
|
||||
|
||||
pthread_t *threads = xmalloc (thread_count * sizeof (pthread_t));
|
||||
xpthread_barrier_init (&barrier, NULL, thread_count);
|
||||
xpthread_mutex_init (&mutex, NULL);
|
||||
|
||||
for (i = 0; i < thread_count; i++)
|
||||
threads[i] = xpthread_create (NULL, thr_func, (void *) (uintptr_t) i);
|
||||
|
||||
for (i = 0; i < thread_count; i++)
|
||||
xpthread_join (threads[i]);
|
||||
|
||||
xpthread_barrier_destroy (&barrier);
|
||||
free (threads);
|
||||
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
#define OPT_ITERATIONS 10000
|
||||
#define OPT_THREADS 10001
|
||||
#define CMDLINE_OPTIONS \
|
||||
{ "iterations", required_argument, NULL, OPT_ITERATIONS }, \
|
||||
{ "threads", required_argument, NULL, OPT_THREADS },
|
||||
static void
|
||||
cmdline_process (int c)
|
||||
{
|
||||
long long int arg = strtoll (optarg, NULL, 0);
|
||||
switch (c)
|
||||
{
|
||||
case OPT_ITERATIONS:
|
||||
if (arg > 0)
|
||||
iteration_count = arg;
|
||||
break;
|
||||
case OPT_THREADS:
|
||||
if (arg > 0 && arg < 100)
|
||||
thread_count = arg;
|
||||
break;
|
||||
}
|
||||
}
|
||||
#define CMDLINE_PROCESS cmdline_process
|
||||
#define TIMEOUT 50
|
||||
#include <support/test-driver.c>
|
||||
|
|
@ -124,7 +124,27 @@ struct __pthread_mutex_s
|
|||
unsigned int __nusers;
|
||||
#endif
|
||||
/* KIND must stay at this position in the structure to maintain
|
||||
binary compatibility with static initializers. */
|
||||
binary compatibility with static initializers.
|
||||
|
||||
Concurrency notes:
|
||||
The __kind of a mutex is initialized either by the static
|
||||
PTHREAD_MUTEX_INITIALIZER or by a call to pthread_mutex_init.
|
||||
|
||||
After a mutex has been initialized, the __kind of a mutex is usually not
|
||||
changed. BUT it can be set to -1 in pthread_mutex_destroy or elision can
|
||||
be enabled. This is done concurrently in the pthread_mutex_*lock functions
|
||||
by using the macro FORCE_ELISION. This macro is only defined for
|
||||
architectures which supports lock elision.
|
||||
|
||||
For elision, there are the flags PTHREAD_MUTEX_ELISION_NP and
|
||||
PTHREAD_MUTEX_NO_ELISION_NP which can be set in addition to the already set
|
||||
type of a mutex.
|
||||
Before a mutex is initialized, only PTHREAD_MUTEX_NO_ELISION_NP can be set
|
||||
with pthread_mutexattr_settype.
|
||||
After a mutex has been initialized, the functions pthread_mutex_*lock can
|
||||
enable elision - if the mutex-type and the machine supports it - by setting
|
||||
the flag PTHREAD_MUTEX_ELISION_NP. This is done concurrently. Afterwards
|
||||
the lock / unlock functions are using specific elision code-paths. */
|
||||
int __kind;
|
||||
__PTHREAD_COMPAT_PADDING_MID
|
||||
#if __PTHREAD_MUTEX_NUSERS_AFTER_KIND
|
||||
|
|
|
|||
|
|
@ -18,9 +18,45 @@
|
|||
|
||||
/* Automatically enable elision for existing user lock kinds. */
|
||||
#define FORCE_ELISION(m, s) \
|
||||
if (__pthread_force_elision \
|
||||
&& (m->__data.__kind & PTHREAD_MUTEX_ELISION_FLAGS_NP) == 0) \
|
||||
if (__pthread_force_elision) \
|
||||
{ \
|
||||
mutex->__data.__kind |= PTHREAD_MUTEX_ELISION_NP; \
|
||||
s; \
|
||||
/* See concurrency notes regarding __kind in \
|
||||
struct __pthread_mutex_s in \
|
||||
sysdeps/nptl/bits/thread-shared-types.h. \
|
||||
\
|
||||
There are the following cases for the kind of a mutex \
|
||||
(The mask PTHREAD_MUTEX_ELISION_FLAGS_NP covers the flags \
|
||||
PTHREAD_MUTEX_ELISION_NP and PTHREAD_MUTEX_NO_ELISION_NP where \
|
||||
only one of both flags can be set): \
|
||||
- both flags are not set: \
|
||||
This is the first lock operation for this mutex. Enable \
|
||||
elision as it is not enabled so far. \
|
||||
Note: It can happen that multiple threads are calling e.g. \
|
||||
pthread_mutex_lock at the same time as the first lock \
|
||||
operation for this mutex. Then elision is enabled for this \
|
||||
mutex by multiple threads. Storing with relaxed MO is enough \
|
||||
as all threads will store the same new value for the kind of \
|
||||
the mutex. But we have to ensure that we always use the \
|
||||
elision path regardless if this thread has enabled elision or \
|
||||
another one. \
|
||||
\
|
||||
- PTHREAD_MUTEX_ELISION_NP flag is set: \
|
||||
Elision was already enabled for this mutex by a previous lock \
|
||||
operation. See case above. Just use the elision path. \
|
||||
\
|
||||
- PTHREAD_MUTEX_NO_ELISION_NP flag is set: \
|
||||
Elision was explicitly disabled by pthread_mutexattr_settype. \
|
||||
Do not use the elision path. \
|
||||
Note: The flag PTHREAD_MUTEX_NO_ELISION_NP will never be \
|
||||
changed after mutex initialization. */ \
|
||||
int mutex_kind = atomic_load_relaxed (&((m)->__data.__kind)); \
|
||||
if ((mutex_kind & PTHREAD_MUTEX_ELISION_FLAGS_NP) == 0) \
|
||||
{ \
|
||||
mutex_kind |= PTHREAD_MUTEX_ELISION_NP; \
|
||||
atomic_store_relaxed (&((m)->__data.__kind), mutex_kind); \
|
||||
} \
|
||||
if ((mutex_kind & PTHREAD_MUTEX_ELISION_NP) != 0) \
|
||||
{ \
|
||||
s; \
|
||||
} \
|
||||
}
|
||||
|
|
|
|||
|
|
@ -18,9 +18,45 @@
|
|||
|
||||
/* Automatically enable elision for existing user lock kinds. */
|
||||
#define FORCE_ELISION(m, s) \
|
||||
if (__pthread_force_elision \
|
||||
&& (m->__data.__kind & PTHREAD_MUTEX_ELISION_FLAGS_NP) == 0) \
|
||||
if (__pthread_force_elision) \
|
||||
{ \
|
||||
mutex->__data.__kind |= PTHREAD_MUTEX_ELISION_NP; \
|
||||
s; \
|
||||
/* See concurrency notes regarding __kind in \
|
||||
struct __pthread_mutex_s in \
|
||||
sysdeps/nptl/bits/thread-shared-types.h. \
|
||||
\
|
||||
There are the following cases for the kind of a mutex \
|
||||
(The mask PTHREAD_MUTEX_ELISION_FLAGS_NP covers the flags \
|
||||
PTHREAD_MUTEX_ELISION_NP and PTHREAD_MUTEX_NO_ELISION_NP where \
|
||||
only one of both flags can be set): \
|
||||
- both flags are not set: \
|
||||
This is the first lock operation for this mutex. Enable \
|
||||
elision as it is not enabled so far. \
|
||||
Note: It can happen that multiple threads are calling e.g. \
|
||||
pthread_mutex_lock at the same time as the first lock \
|
||||
operation for this mutex. Then elision is enabled for this \
|
||||
mutex by multiple threads. Storing with relaxed MO is enough \
|
||||
as all threads will store the same new value for the kind of \
|
||||
the mutex. But we have to ensure that we always use the \
|
||||
elision path regardless if this thread has enabled elision or \
|
||||
another one. \
|
||||
\
|
||||
- PTHREAD_MUTEX_ELISION_NP flag is set: \
|
||||
Elision was already enabled for this mutex by a previous lock \
|
||||
operation. See case above. Just use the elision path. \
|
||||
\
|
||||
- PTHREAD_MUTEX_NO_ELISION_NP flag is set: \
|
||||
Elision was explicitly disabled by pthread_mutexattr_settype. \
|
||||
Do not use the elision path. \
|
||||
Note: The flag PTHREAD_MUTEX_NO_ELISION_NP will never be \
|
||||
changed after mutex initialization. */ \
|
||||
int mutex_kind = atomic_load_relaxed (&((m)->__data.__kind)); \
|
||||
if ((mutex_kind & PTHREAD_MUTEX_ELISION_FLAGS_NP) == 0) \
|
||||
{ \
|
||||
mutex_kind |= PTHREAD_MUTEX_ELISION_NP; \
|
||||
atomic_store_relaxed (&((m)->__data.__kind), mutex_kind); \
|
||||
} \
|
||||
if ((mutex_kind & PTHREAD_MUTEX_ELISION_NP) != 0) \
|
||||
{ \
|
||||
s; \
|
||||
} \
|
||||
}
|
||||
|
|
|
|||
|
|
@ -18,9 +18,45 @@
|
|||
|
||||
/* Automatically enable elision for existing user lock kinds. */
|
||||
#define FORCE_ELISION(m, s) \
|
||||
if (__pthread_force_elision \
|
||||
&& (m->__data.__kind & PTHREAD_MUTEX_ELISION_FLAGS_NP) == 0) \
|
||||
if (__pthread_force_elision) \
|
||||
{ \
|
||||
mutex->__data.__kind |= PTHREAD_MUTEX_ELISION_NP; \
|
||||
s; \
|
||||
/* See concurrency notes regarding __kind in \
|
||||
struct __pthread_mutex_s in \
|
||||
sysdeps/nptl/bits/thread-shared-types.h. \
|
||||
\
|
||||
There are the following cases for the kind of a mutex \
|
||||
(The mask PTHREAD_MUTEX_ELISION_FLAGS_NP covers the flags \
|
||||
PTHREAD_MUTEX_ELISION_NP and PTHREAD_MUTEX_NO_ELISION_NP where \
|
||||
only one of both flags can be set): \
|
||||
- both flags are not set: \
|
||||
This is the first lock operation for this mutex. Enable \
|
||||
elision as it is not enabled so far. \
|
||||
Note: It can happen that multiple threads are calling e.g. \
|
||||
pthread_mutex_lock at the same time as the first lock \
|
||||
operation for this mutex. Then elision is enabled for this \
|
||||
mutex by multiple threads. Storing with relaxed MO is enough \
|
||||
as all threads will store the same new value for the kind of \
|
||||
the mutex. But we have to ensure that we always use the \
|
||||
elision path regardless if this thread has enabled elision or \
|
||||
another one. \
|
||||
\
|
||||
- PTHREAD_MUTEX_ELISION_NP flag is set: \
|
||||
Elision was already enabled for this mutex by a previous lock \
|
||||
operation. See case above. Just use the elision path. \
|
||||
\
|
||||
- PTHREAD_MUTEX_NO_ELISION_NP flag is set: \
|
||||
Elision was explicitly disabled by pthread_mutexattr_settype. \
|
||||
Do not use the elision path. \
|
||||
Note: The flag PTHREAD_MUTEX_NO_ELISION_NP will never be \
|
||||
changed after mutex initialization. */ \
|
||||
int mutex_kind = atomic_load_relaxed (&((m)->__data.__kind)); \
|
||||
if ((mutex_kind & PTHREAD_MUTEX_ELISION_FLAGS_NP) == 0) \
|
||||
{ \
|
||||
mutex_kind |= PTHREAD_MUTEX_ELISION_NP; \
|
||||
atomic_store_relaxed (&((m)->__data.__kind), mutex_kind); \
|
||||
} \
|
||||
if ((mutex_kind & PTHREAD_MUTEX_ELISION_NP) != 0) \
|
||||
{ \
|
||||
s; \
|
||||
} \
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue