9c4c002459
1998-09-14 Andreas Jaeger <aj@arthur.rhein-neckar.de> * sysdeps/mach/hurd/dl-cache.c (_dl_unload_cache): New dummy function. Reported by okuji@kuicr.kyoto-u.ac.jp [PR libc/789]. 1998-09-15 David S. Miller <davem@pierdol.cobaltmicro.com> * sysdeps/sparc/sparc32/dl-machine.h (elf_machine_runtime_setup): Add profiling support. (TRAMPOLINE_TEMPLATE): New macro. (ELF_MACHINE_RUNTIME_TRAMPOLINE): Define in terms of that. (RTLD_START): Prettify, and set __libc_stack_end properly. (elf_machine_rela) [R_SPARC_COPY]: Remove RTLD_BOOTSTRAP ifndef and check for sym being NULL instead. * sysdeps/sparc/sparc64/addmul_1.S: Adjust to allocate 192 bytes of stack space. * sysdeps/sparc/sparc64/lshift.S: Likewise. * sysdeps/sparc/sparc64/mul_1.S: Likewise. * sysdeps/sparc/sparc64/rshift.S: Likewise. * sysdeps/sparc/sparc64/submul_1.S: Likewise. * sysdeps/sparc/sparc64/elf/crtbegin.S: Likewise and remove old MEDANY code model %g4 usage. * sysdeps/sparc/sparc64/elf/crtend.S: Likewise and remove old MEDANY code model %g4 usage. * sysdeps/sparc/sparc64/elf/start.S: Rework to not use old FULLANY code model address formation. * sysdeps/sparc/sparc64/dl-machine.h: Don't include link.h, do include elf/ldsodefs.h (DT_SPARC): Remove. (elf_machine_matches_host): It is now EM_SPARCV9. (elf_machine_dynamic): Clean up to remove ugly cast. (elf_machine_fixup_plt): Rework for new V9 ABI, add support for new PLT formats. (elf_machine_rela): Don't do anything at all for R_SPARC_NONE. Prettify rest of function. [R_SPARC_COPY]: Check for sym being NULL. [R_SPARC_32]: Handle it. [R_SPARC_H44, R_SPARC_M44, R_SPARC_L44]: Handle them for the MEDMID code model. [R_SPARC_HH22, R_SPARC_HM10, R_SPARC_LM22]: Handle them for the MEDANY code model. [R_SPARC_NONE]: Remove this case, as it is now checked earlier. (elf_machine_runtime_setup): Rewrite for new V9 ABI plt formats. Add profiling support. (TRAMPOLINE_TEMPLATE): New macro. (ELF_MACHINE_RUNTIME_TRAMPOLINE): Define in terms of that. (RTLD_START): Prettify and set __libc_stack_end. * sysdeps/unix/sysv/linux/sparc/bits/sigaction.h (SA_SIGINFO): Define. * sysdeps/unix/sysv/linux/sparc/bits/signum.h (_NSIG): Set to 64. (SIGRTMIN, SIGRTMAX, __SIGRTMIN, __SIGRTMAX): Define. * sysdeps/unix/sysv/linux/sparc/sparc32/brk.c (__brk): Remove unused variable scratch. * sysdeps/unix/sysv/linux/sparc/sparc32/sigaction.c (__syscall_rt_sigaction, __rt_sigreturn_stub, __sigreturn_stub): Declare. (__sigaction): Rewrite rt_sigaction case to pass correct sigreturn stub to rt_sigaction syscalls. Rewrite non-rt case to use correct old format kernel sigaction structures. * sysdeps/unix/sysv/linux/sparc/sparc64/ucontext.h: Move... * sysdeps/unix/sysv/linux/sparc/sparc64/sys/ucontext.h: to here. * sysdeps/unix/sysv/linux/sparc/sparc64/Dist: Remove ucontext.h * sysdeps/unix/sysv/linux/sparc/sparc64/bits/setjmp.h: Fix ucontext include. (_JMPBUF_UNWINDS): Define. * sysdeps/unix/sysv/linux/sparc/sparc64/bits/statfs.h: Declare statfs64 structure, which is exactly the same as the normal one. * sysdeps/unix/sysv/linux/sparc/sparc64/brk.S: Allocate 192 bytes of stack. Use correct syscall trap number. Add branch prediction settings to branch instructions. Remove old MEDANY code model %g4 referneces for non-PIC. * sysdeps/unix/sysv/linux/sparc/sparc64/clone.S: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/init-first.h: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/pipe.S: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/syscall.S: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/sysdep.h: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/longjmp.S: Add __libc_longjmp and __libc_siglongjmp strong aliases. * sysdeps/unix/sysv/linux/sparc/sparc64/readdir.c (__readdir64): Also define to __no__readdir64_decl around readdir.c inclusion. (__readdir64): Add strong alias. * sysdeps/unix/sysv/linux/sparc/sparc64/socket.S: New file. * sysdeps/unix/sysv/linux/sparc/sparc64/syscalls.list (getrlimit): Set strong and weak names properly. 1998-09-16 11:25 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * manual/Makefile (AWK): Default to gawk if standalone. 1998-09-15 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * Makefile (distribute): Undo last change. * Make-dist (+tsrc) [not subdir]: Also include indirection headers for sysdep headers. (+subdir-headers): Removed, unused. 1998-09-15 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * stdio-common/Makefile ($(inst_includedir)/bits/stdio_lim.h): Use $(do-install). 1998-09-15 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * Makerules ($(+sysdir_pfx)sysd-Makefile): Don't check for absolute name in $(config-sysdirs), can never happen. ($(+sysdir_pfx)sysd-rules): Likewise. * Makeconfig (full-config-sysdirs): Likewise. (all-Subdirs-files): Prepend $(..). * configure.in: Don't check for absolute name in $add_ons_pfx, can not happen. Let --enable-add-ons=yes work if no add-ons actually exist. 1998-09-15 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * Rules ($(common-objpfx)bits/stdio_%.h): Remove extra continuations in command. 1998-09-15 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * libio/oldstdfiles.c (_IO_stdin_used): Update declaration. |
||
---|---|---|
.. | ||
Examples | ||
man | ||
sysdeps | ||
attr.c | ||
Banner | ||
cancel.c | ||
ChangeLog | ||
Changes | ||
condvar.c | ||
configure | ||
errno.c | ||
FAQ.html | ||
internals.h | ||
join.c | ||
LICENSE | ||
linuxthreads.texi | ||
lockfile.c | ||
Makefile | ||
manager.c | ||
mutex.c | ||
ptfork.c | ||
pthread.c | ||
ptlongjmp.c | ||
queue.h | ||
README | ||
README.Xfree3.2 | ||
restart.h | ||
rwlock.c | ||
semaphore.c | ||
semaphore.h | ||
shlib-versions | ||
signals.c | ||
specific.c | ||
spinlock.c | ||
spinlock.h | ||
Versions | ||
weaks.c | ||
wrapsyscall.c |
Linuxthreads - POSIX 1003.1c kernel threads for Linux Copyright 1996, 1997 Xavier Leroy (Xavier.Leroy@inria.fr) DESCRIPTION: This is release 0.7 (late beta) of LinuxThreads, a BiCapitalized implementation of the Posix 1003.1c "pthread" interface for Linux. LinuxThreads provides kernel-level threads: each thread is a separate Unix process, sharing its address space with the other threads through the new system call clone(). Scheduling between threads is handled by the kernel scheduler, just like scheduling between Unix processes. REQUIREMENTS: - Linux version 2.0 and up (requires the new clone() system call and the new realtime scheduler). - For Intel platforms: libc 5.2.18 or later is required. 5.2.18 or 5.4.12 or later are recommended; 5.3.12 and 5.4.7 have problems (see the FAQ.html file for more info). - Also supports glibc 2 (a.k.a. libc 6), which actually comes with a specially-adapted version of this library. - Currently supports Intel, Alpha, Sparc, Motorola 68k, ARM and MIPS platforms. - Multiprocessors are supported. INSTALLATION: - Edit the Makefile, set the variables in the "Configuration" section. - Do "make". - Do "make install". USING LINUXTHREADS: gcc -D_REENTRANT ... -lpthread A complete set of manual pages is included. Also see the subdirectory Examples/ for some sample programs. STATUS: - All functions in the Posix 1003.1c base interface implemented. Also supports priority scheduling. - For users of libc 5 (H.J.Lu's libc), a number of C library functions are reimplemented or wrapped to make them thread-safe, including: * malloc functions * stdio functions (define _REENTRANT before including <stdio.h>) * per-thread errno variable (define _REENTRANT before including <errno.h>) * directory reading functions (opendir(), etc) * sleep() * gmtime(), localtime() New library functions provided: * flockfile(), funlockfile(), ftrylockfile() * reentrant versions of network database functions (gethostbyname_r(), etc) and password functions (getpwnam_r(), etc). - libc 6 (glibc 2) provides much better thread support than libc 5, and comes with a specially-adapted version of LinuxThreads. For serious multithreaded programming, you should consider switching to glibc 2. It is available from ftp.gnu.org:/pub/gnu and its mirrors. WARNING: Many existing libraries are not compatible with LinuxThreads, either because they are not inherently thread-safe, or because they have not been compiled with the -D_REENTRANT. For more info, see the FAQ.html file in this directory. A prime example of the latter is Xlib. If you link it with LinuxThreads, you'll probably get an "unknown 0 error" very early. This is just a consequence of the Xlib binaries using the global variable "errno" to fetch error codes, while LinuxThreads and the C library use the per-thread "errno" location. See the file README.Xfree3.3 for info on how to compile the Xfree 3.3 libraries to make them compatible with LinuxThreads. KNOWN BUGS AND LIMITATIONS: - Threads share pretty much everything they should share according to the standard: memory space, file descriptors, signal handlers, current working directory, etc. One thing that they do not share is their pid's and parent pid's. According to the standard, they should have the same, but that's one thing we cannot achieve in this implementation (until the CLONE_PID flag to clone() becomes usable). - The current implementation uses the two signals SIGUSR1 and SIGUSR2, so user-level code cannot employ them. Ideally, there should be two signals reserved for this library. One signal is used for restarting threads blocked on mutexes or conditions; the other is for thread cancellation. *** This is not anymore true when the application runs on a kernel newer than approximately 2.1.60. - The stacks for the threads are allocated high in the memory space, below the stack of the initial process, and spaced 2M apart. Stacks are allocated with the "grow on demand" flag, so they don't use much virtual space initially (4k, currently), but can grow up to 2M if needed. Reserving such a large address space for each thread means that, on a 32-bit architecture, no more than about 1000 threads can coexist (assuming a 2Gb address space for user processes), but this is reasonable, since each thread uses up one entry in the kernel's process table, which is usually limited to 512 processes. Another potential problem of the "grow on demand" scheme is that nothing prevents the user from mmap'ing something in the 2M address window reserved for a thread stack, possibly causing later extensions of that stack to fail. Mapping at fixed addresses should be avoided when using this library. - Signal handling does not fully conform to the Posix standard, due to the fact that threads are here distinct processes that can be sent signals individually, so there's no notion of sending a signal to "the" process (the collection of all threads). More precisely, here is a summary of the standard requirements and how they are met by the implementation: 1- Synchronous signals (generated by the thread execution, e.g. SIGFPE) are delivered to the thread that raised them. (OK.) 2- A fatal asynchronous signal terminates all threads in the process. (OK. The thread manager notices when a thread dies on a signal and kills all other threads with the same signal.) 3- An asynchronous signal will be delivered to one of the threads of the program which does not block the signal (it is unspecified which). (No, the signal is delivered to the thread it's been sent to, based on the pid of the thread. If that thread is currently blocking the signal, the signal remains pending.) 4- The signal will be delivered to at most one thread. (OK, except for signals generated from the terminal or sent to the process group, which will be delivered to all threads.) - The current implementation of the MIPS support assumes a MIPS ISA II processor or better. These processors support atomic operations by ll/sc instructions. Older R2000/R3000 series processors are not supported yet; support for these will have higher overhead. - The current implementation of the ARM support assumes that the SWP (atomic swap register with memory) instruction is available. This is the case for all processors except for the ARM1 and ARM2. On StrongARM, the SWP instruction does not bypass the cache, so multi-processor support will be more troublesome.