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* sysdeps/pthread/pthread_cond_wait.c (__pthread_cond_wait): Don't
	store mutex address if the current value is ~0l.
	* sysdeps/pthread/pthread_cond_timedwait.c
	(__pthread_cond_timedwait): Likewise.
	* sysdeps/pthread/pthread_cond_broadcast.c
	(__pthread_cond_broadcast): Don't use requeue for pshared
	condvars.

	* sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S
	(__pthread_cond_wait): Don't store mutex address if the current
	value is ~0l.
	* sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S
	(__pthread_cond_timedwait): Likewise.
	* sysdeps/unix/sysv/linux/x86_64/pthread_cond_broadcast.S
	(__pthread_cond_broadcast): Don't use requeue for pshared
	condvars.

	* pthread_cond_init.c (__pthread_cond_init): Initialize __mutex
	element with ~0l for pshared condvars, with NULL otherwise.

	* sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S
	(__pthread_cond_wait): Don't store mutex address if the current
	value is ~0l.
	* sysdeps/unix/sysv/linux/i386/i486/pthread_cond_timedwait.S
	(__pthread_cond_timedwait): Likewise.
	* sysdeps/unix/sysv/linux/i386/i486/pthread_cond_broadcast.S
	(__pthread_cond_broadcast): Don't use requeue for pshared
	condvars.
This commit is contained in:
Ulrich Drepper 2003-11-21 10:00:11 +00:00
parent bf68b2366d
commit e42a990ecc
11 changed files with 72 additions and 23 deletions
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29
nptl/ChangeLog
View file

@ -1,5 +1,34 @@
2003-11-21 Ulrich Drepper <drepper@redhat.com>
* sysdeps/pthread/pthread_cond_wait.c (__pthread_cond_wait): Don't
store mutex address if the current value is ~0l.
* sysdeps/pthread/pthread_cond_timedwait.c
(__pthread_cond_timedwait): Likewise.
* sysdeps/pthread/pthread_cond_broadcast.c
(__pthread_cond_broadcast): Don't use requeue for pshared
condvars.
* sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S
(__pthread_cond_wait): Don't store mutex address if the current
value is ~0l.
* sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S
(__pthread_cond_timedwait): Likewise.
* sysdeps/unix/sysv/linux/x86_64/pthread_cond_broadcast.S
(__pthread_cond_broadcast): Don't use requeue for pshared
condvars.
* pthread_cond_init.c (__pthread_cond_init): Initialize __mutex
element with ~0l for pshared condvars, with NULL otherwise.
* sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S
(__pthread_cond_wait): Don't store mutex address if the current
value is ~0l.
* sysdeps/unix/sysv/linux/i386/i486/pthread_cond_timedwait.S
(__pthread_cond_timedwait): Likewise.
* sysdeps/unix/sysv/linux/i386/i486/pthread_cond_broadcast.S
(__pthread_cond_broadcast): Don't use requeue for pshared
condvars.
* Makefile: Add rules to build and run tst-cond12 and tst-cond13.
* tst-cond12.c: New file.
* tst-cond13.c: New file.

2
nptl/pthread_cond_init.c
View file

@ -36,6 +36,8 @@ __pthread_cond_init (cond, cond_attr)
cond->__data.__total_seq = 0;
cond->__data.__wakeup_seq = 0;
cond->__data.__woken_seq = 0;
cond->__data.__mutex = (icond_attr == NULL || (icond_attr->value & 1) == 0
? NULL : (void *) ~0l);
return 0;
}

7
nptl/sysdeps/pthread/pthread_cond_broadcast.c
View file

@ -54,6 +54,10 @@ __pthread_cond_broadcast (cond)
# error "No valid byte order"
#endif
/* Do not use requeue for pshared condvars. */
if (cond->__data.__mutex == (void *) ~0l)
goto wake_all;
/* Wake everybody. */
pthread_mutex_t *mut = (pthread_mutex_t *) cond->__data.__mutex;
if (__builtin_expect (lll_futex_requeue (futex, 1, INT_MAX,
@ -61,9 +65,8 @@ __pthread_cond_broadcast (cond)
0))
{
/* The requeue functionality is not available. */
#ifndef __ASSUME_FUTEX_REQUEUE
wake_all:
lll_futex_wake (futex, INT_MAX);
#endif
}
/* That's all. */

6
nptl/sysdeps/pthread/pthread_cond_timedwait.c
View file

@ -67,8 +67,10 @@ __pthread_cond_timedwait (cond, mutex, abstime)
++cond->__data.__total_seq;
/* Remember the mutex we are using here. If there is already a
different address store this is a bad user bug. */
cond->__data.__mutex = mutex;
different address store this is a bad user bug. Do not store
anything for pshared condvars. */
if (cond->__data.__mutex != (void *) ~0l)
cond->__data.__mutex = mutex;
/* Prepare structure passed to cancellation handler. */
cbuffer.cond = cond;

6
nptl/sysdeps/pthread/pthread_cond_wait.c
View file

@ -93,8 +93,10 @@ __pthread_cond_wait (cond, mutex)
++cond->__data.__total_seq;
/* Remember the mutex we are using here. If there is already a
different address store this is a bad user bug. */
cond->__data.__mutex = mutex;
different address store this is a bad user bug. Do not store
anything for pshared condvars. */
if (cond->__data.__mutex != (void *) ~0l)
cond->__data.__mutex = mutex;
/* Prepare structure passed to cancellation handler. */
cbuffer.cond = cond;

11
nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_broadcast.S
View file

@ -83,8 +83,12 @@ __pthread_cond_broadcast:
subl $1, cond_lock-wakeup_seq(%ebx)
jne 7f
/* Don't use requeue for pshared condvars. */
8: cmpl $-1, %edi
je 9f
/* Wake up all threads. */
8: movl $FUTEX_REQUEUE, %ecx
movl $FUTEX_REQUEUE, %ecx
movl $SYS_futex, %eax
movl $0x7fffffff, %esi
movl $1, %edx
@ -97,10 +101,9 @@ __pthread_cond_broadcast:
#ifndef __ASSUME_FUTEX_REQUEUE
cmpl $-EINVAL, %eax
je 9f
10:
#endif
xorl %eax, %eax
10: xorl %eax, %eax
popl %edi
popl %esi
popl %ebx
@ -138,14 +141,12 @@ __pthread_cond_broadcast:
call __lll_mutex_unlock_wake
jmp 8b
#ifndef __ASSUME_FUTEX_REQUEUE
9: /* The futex requeue functionality is not available. */
movl $0x7fffffff, %edx
movl $FUTEX_WAKE, %ecx
movl $SYS_futex, %eax
ENTER_KERNEL
jmp 10b
#endif
.size __pthread_cond_broadcast, .-__pthread_cond_broadcast
versioned_symbol (libpthread, __pthread_cond_broadcast, pthread_cond_broadcast,
GLIBC_2_3_2)

6
nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_timedwait.S
View file

@ -68,11 +68,13 @@ __pthread_cond_timedwait:
/* Store the reference to the mutex. If there is already a
different value in there this is a bad user bug. */
2: movl 24(%esp), %eax
2: cmpl $-1, dep_mutex(%ebx)
movl 24(%esp), %eax
je 17f
movl %eax, dep_mutex(%ebx)
/* Unlock the mutex. */
xorl %edx, %edx
17: xorl %edx, %edx
call __pthread_mutex_unlock_usercnt
testl %eax, %eax

6
nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S
View file

@ -65,11 +65,13 @@ __pthread_cond_wait:
/* Store the reference to the mutex. If there is already a
different value in there this is a bad user bug. */
2: movl 20(%esp), %eax
2: cmpl $-1, dep_mutex(%ebx)
movl 20(%esp), %eax
je 15f
movl %eax, dep_mutex(%ebx)
/* Unlock the mutex. */
xorl %edx, %edx
15: xorl %edx, %edx
call __pthread_mutex_unlock_usercnt
testl %eax, %eax

10
nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_broadcast.S
View file

@ -72,8 +72,11 @@ __pthread_cond_broadcast:
decl cond_lock-wakeup_seq(%rdi)
jne 7f
8: cmpq $-1, %r8
je 9f
/* Wake up all threads. */
8: movq $FUTEX_REQUEUE, %rsi
movq $FUTEX_REQUEUE, %rsi
movq $SYS_futex, %rax
movl $1, %edx
movq $0x7fffffff, %r10
@ -82,10 +85,9 @@ __pthread_cond_broadcast:
#ifndef __ASSUME_FUTEX_REQUEUE
cmpq $-EINVAL, %rax
je 9f
10:
#endif
xorl %eax, %eax
10: xorl %eax, %eax
retq
.align 16
@ -119,14 +121,12 @@ __pthread_cond_broadcast:
subq $cond_lock-wakeup_seq, %rdi
jmp 8b
#ifndef __ASSUME_FUTEX_REQUEUE
9: /* The futex requeue functionality is not available. */
movq $0x7fffffff, %rdx
movq $FUTEX_WAKE, %rsi
movq $SYS_futex, %rax
syscall
jmp 10b
#endif
.size __pthread_cond_broadcast, .-__pthread_cond_broadcast
versioned_symbol (libpthread, __pthread_cond_broadcast, pthread_cond_broadcast,
GLIBC_2_3_2)

5
nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S
View file

@ -71,15 +71,18 @@ __pthread_cond_timedwait:
+--------------------------+
*/
cmpq $-1, dep_mutex(%rdi)
/* Prepare structure passed to cancellation handler. */
movq %rdi, 8(%rsp)
movq %rsi, 16(%rsp)
movq %rdx, %r13
je 22f
movq %rsi, dep_mutex(%rdi)
/* Get internal lock. */
movl $1, %esi
22: movl $1, %esi
xorl %eax, %eax
LOCK
#if cond_lock == 0

7
nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S
View file

@ -117,14 +117,17 @@ __pthread_cond_wait:
+--------------------------+
*/
/* Prepare structure passed to cancellation handler. */
cmpq $-1, dep_mutex(%rdi)
/* Prepare structure passed to cancellation handler. */
movq %rdi, 8(%rsp)
movq %rsi, 16(%rsp)
je 15f
movq %rsi, dep_mutex(%rdi)
/* Get internal lock. */
movl $1, %esi
15: movl $1, %esi
xorl %eax, %eax
LOCK
#if cond_lock == 0