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2002-02-02 * cancel.c: Rearranged some code and introduced checksrpj
to disable cancelation at the start of a thread's cancelation run to prevent double cancelation. The main problem arises if a thread is canceling and then receives a subsequent async cancel request. * private.c: Likewise. * condvar.c: Place pragmas around cleanup_push/pop to turn off inline optimisation (/Obn where n>0 - MSVC only). Various optimisation switches in MSVC turn this on, which interferes with the way that cleanup handlers are run in C++ EH and SEH code. Application code compiled with inline optimisation must also wrap cleanup_push/pop blocks with the pragmas, e.g. #pragma inline_depth(0) pthread_cleanup_push(...) ... pthread_cleanup_pop(...) #pragma inline_depth(8) * rwlock.c: Likewise. * mutex.c: Remove attempts to inline some functions. * signal.c: Modify misleading comment. tests/ * mutex8: New test. * mutex8n: New test. * mutex8e: New test. * mutex8r: New test. * cancel6a: New test. * cancel6d: New test. * cleanup0.c: Add pragmas for inline optimisation control. * cleanup1.c: Add pragmas for inline optimisation control. * cleanup2.c: Add pragmas for inline optimisation control. * cleanup3.c: Add pragmas for inline optimisation control. * condvar7.c: Add pragmas for inline optimisation control. * condvar8.c: Add pragmas for inline optimisation control. * condvar9.c: Add pragmas for inline optimisation control.
2002-02-01 * semaphore.c (sem_trywait): Fix missing errno returnrpj
for systems that define NEED_SEM (e.g. early WinCE). * mutex.c (pthread_mutex_timedlock): Return ENOTSUP for systems that define NEED_SEM since they don't have sem_trywait().
2002-02-01pthread_mutex_timedlock: Add missing InterlockedDecrement(lock_idx)rpj
for the case where abstime has passed already. Make routines INLINEable since some are called by other routines in this module.
2002-01-31Add new exported routines.rpj
2002-01-31Fix critical section init.rpj
2002-01-312002-01-27 Ross Johnson <rpj@special.ise.canberra.edu.au>rpj
* mutex.c (pthread_mutex_timedlock): New function suggested by Alexander Terekhov. The logic required to implement this properly came from Alexander, with some collaboration with Thomas Pfaff. (pthread_mutex_unlock): Wrap the waiters check and sema post in a critical section to prevent a race with pthread_mutex_timedlock. (ptw32_timed_semwait): New function; returns a special result if the absolute timeout parameter represents a time already passed when called; used by pthread_mutex_timedwait(). Have deliberately not reused the name "ptw32_sem_timedwait" because they are not the same routine. * condvar.c (ptw32_cond_timedwait): Use the new sem_timedwait() instead of ptw32_sem_timedwait(), which now has a different function. See previous. * implement.h: Remove prototype for ptw32_sem_timedwait. See next. (pthread_mutex_t_): Add critical section element for access to lock_idx during mutex post-timeout processing. * semaphore.h (sem_timedwait): See next. * semaphore.c (sem_timedwait): See next. * private.c (ptw32_sem_timedwait): Move to semaphore.c and rename as sem_timedwait(). 2002-01-18 Ross Johnson <rpj@special.ise.canberra.edu.au> * sync.c (pthread_join): Was getting the exit code from the calling thread rather than the joined thread if defined(__MINGW32__) && !defined(__MSVCRT__). 2002-01-15 Ross Johnson <rpj@special.ise.canberra.edu.au> * pthread.h: Unless the build explicitly defines __CLEANUP_SEH, __CLEANUP_CXX, or __CLEANUP_C, then the build defaults to __CLEANUP_C style cleanup. This style uses setjmp/longjmp in the cancelation and thread exit implementations and therefore won't do stack unwinding if linked to applications that have it (e.g. C++ apps). This is currently consistent with most/all commercial Unix POSIX threads implementations. * spin.c (pthread_spin_init): Edit renamed function call. * nonportable.c (pthread_num_processors_np): New. (pthread_getprocessors_np): Renamed to ptw32_getprocessors and moved to private.c. * private.c (pthread_getprocessors): Moved here from nonportable.c. * pthread.def (pthread_getprocessors_np): Removed from export list. * rwlock.c (pthread_rwlockattr_init): New. (pthread_rwlockattr_destroy): New. (pthread_rwlockattr_getpshared): New. (pthread_rwlockattr_setpshared): New.
2002-01-13 * attr.c (pthread_attr_setscope): Fix struct pointerrpj
indirection error introduced 2002-01-04. (pthread_attr_getscope): Likewise. * pthread.dsp (SOURCE): Add missing source files. ./tests/: * exception3.c (main): Shorten wait time. * mutex7.c: New test. * mutex7n.c: New test. * mutex7e.c: New test. * mutex7r.c: New test. * mutex6.c: Modified to avoid leaving the locked mutex around on exit.
2002-01-08Update docs.rpj
2002-01-08 * mutex.c (pthread_mutex_trylock): userpj
ptw32_interlocked_compare_exchange function pointer rather than ptw32_InterlockedCompareExchange() directly to retain portability to non-iX86 processors, e.g. WinCE etc. The pointer will point to the native OS version of InterlockedCompareExchange() if the OS supports it (see ChangeLog entry of 2001-10-17).
2002-01-07 * mutex.c (pthread_mutex_init): Remove criticalrpj
section calls. (pthread_mutex_destroy): Likewise. (pthread_mutex_unlock): Likewise. (pthread_mutex_trylock): Likewise; recursive mutexes now increment the lock count rather than return EBUSY; errorcheck mutexes return EDEADLCK rather than EBUSY. This behaviour is consistent with the Solaris pthreads implementation. * implement.h (pthread_mutex_t_): Remove critical section element - no longer needed.
2002-01-04 * attr.c (pthread_attr_setscope): Add more errorrpj
checking and actually store the scope value even though it's not really necessary. (pthread_attr_getscope): Return stored value. * implement.h (pthread_attr_t_): Add new scope element. * ANNOUNCE: Fix out of date comment next to pthread_attr_setscope in conformance section.
2001-12-20 * mutex.c (pthread_mutex_lock): Decrementing lock_idx wasrpj
not thread-safe. (pthread_mutex_trylock): Likewise.
2001-12-20Fix some typos and add a contributor.rpj
2001-12-18Include an interim complete Copyright notice in each source file;rpj
Remove unused autoconf files; Add the file COPYING, which describes the pthread-win32 license relative to the FSF LGPL.
2001-10-26semaphore.c (sem_init): somehow when sem_t reverted to an opaque structrpj
the calloc NULL check was left in the conditionally included section. (sem_destroy): Likewise, the calloced sem_t wasn't being freed.
2001-10-26 * semaphore.c (sem_init): Fix typo and missing bracketrpj
in conditionally compiled code. Only older versions of WinCE require this code, hence it doesn't normally get tested.
2001-10-25 * GNUmakefile (libwsock32): Add to linker flags forrpj
WSAGetLastError() and WSASetLastError(). * Makefile (wsock32.lib): Likewise. * create.c: Minor mostly inert changes. * implement.h (PTW32_MAX): Move into here and renamed from sched.h. (PTW32_MIN): Likewise. * GNUmakefile (TEST_ICE): Define if testing internal implementation of InterlockedCompareExchange. * Makefile (TEST_ICE): Likewise. * private.c (TEST_ICE): Likewise.
2001-10-25 * barrier.c: Move _LONG and _LPLONG defines intorpj
implement.h; rename to PTW32_INTERLOCKED_LONG and PTW32_INTERLOCKED_LPLONG respectively. * spin.c: Likewise; ptw32_interlocked_compare_exchange used in place of InterlockedCompareExchange directly. * global.c (ptw32_interlocked_compare_exchange): Add prototype for this new routine pointer to be used when InterlockedCompareExchange isn't supported by Windows. * nonportable.c (pthread_win32_process_attach_np): Check for support of InterlockedCompareExchange in kernel32 and assign its address to ptw32_interlocked_compare_exchange if it exists, or our own ix86 specific implementation ptw32_InterlockedCompareExchange. *private.c (ptw32_InterlockedCompareExchange): An implementation of InterlockedCompareExchange() which is specific to ix86; written directly in assembler for either MSVC or GNU C; needed because Windows 95 doesn't support InterlockedCompareExchange(). * sched.c (sched_get_priority_min): Extend to return THREAD_PRIORITY_IDLE. (sched_get_priority_max): Extend to return THREAD_PRIORITY_CRITICAL.
2001-10-24 * attr.c (pthread_attr_setstacksize): Quell warningrpj
from LCC by conditionally compiling the stacksize validity check. LCC correctly warns that the condition (stacksize < PTHREAD_STACK_MIN) is suspicious because STACK_MIN is 0 and stacksize is of type size_t (or unsigned int).
2001-10-15 * spin.c (pthread_spin_lock): PTHREAD_SPINLOCK_INITIALIZERrpj
was causing a program fault. (pthread_spin_init): Could have alloced memory without freeing under some error conditions. * mutex.c (pthread_mutex_init): Move memory allocation of mutex struct after checking for PROCESS_SHARED.
2001-10-12 * spin.c (pthread_spin_unlock): Was not returningrpj
EPERM if the spinlock was not locked, for multi CPU machines.
2001-10-08pthread_spin_trylock was not returning EBUSY on multi CPU machines.rpj
2001-08-24 * condvar.c (pthread_cond_destroy): Remove cv elementrpj
that is no longer used. * implement.h: Likewise.
2001-08-23*** empty log message ***rpj
2001-08-23 Contributed by - "Alexander Terekhov" <TEREKHOV@de.ibm.com>rpj
* condvar.c (pthread_cond_destroy): fix bug with respect to deadlock in the case of concurrent _destroy/_unblock; a condition variable can be destroyed immediately after all the threads that are blocked on it are awakened.
2001-08-23 * tsd.c (pthread_getspecific): Preserve the lastrpj
winsock error [from WSAGetLastError()].
2001-07-18Add new C modules to Nmakefile.rpj
2001-07-18 * rwlock.c (pthread_rwlock_wrlock): Is allowed to berpj
a cancelation point; re-enable deferred cancelability around the CV call.
2001-07-18Fix potential NULL pointer dereferences.rpj
Contributed by - "Scott McCaskill" <scott@magruder.org> * mutex.c (pthread_mutexattr_init): Return ENOMEM immediately and don't dereference the NULL pointer if calloc fails. (pthread_mutexattr_getpshared): Don't dereference a pointer that is possibly NULL. * barrier.c (pthread_barrierattr_init): Likewise (pthread_barrierattr_getpshared): Don't dereference a pointer that is possibly NULL. * condvar.c (pthread_condattr_getpshared): Don't dereference a pointer that is possibly NULL.
2001-07-18 * mutex.c (pthread_mutexattr_init): Return ENOMEMrpj
immediately and don't dereference the NULL pointer if calloc fails. - "Scott McCaskill" <scott@magruder.org>
2001-07-11Assert that exactly one thread receives PTHREAD_BARRIER_SERIAL_THREAD.snap-2001-07-12rpj
2001-07-11Fixed cast; tests passed.rpj
2001-07-10Updated.rpj
2001-07-10Untested revamp of barrier.c.rpj
* barrier.c: Still more revamping. The exclusive access mutex isn't really needed so it has been removed and replaced by an InterlockedDecrement(). nSerial has been removed. iStep is now dual-purpose. The process shared attribute is now stored in the barrier struct. * implement.h (pthread_barrier_t_): Lost some/gained one elements. * private.c (ptw32_threadStart): Removed some comments.
2001-07-09 * barrier.c: Revamped to fix the race condition. Two alternatingrpj
semaphores are used instead of the PulseEvent. Also improved overall throughput by returning PTHREAD_BARRIER_SERIAL_THREAD to the first waking thread. * implement.h (pthread_barrier_t_): Revamped.
2001-07-08Barriers fixed and tested more extensively.rpj
* barrier.c: Fix several bugs in all routines. Now passes tests/barrier5.c which is fairly rigorous. There is still a non-optimal work-around for a race condition between the barrier breeched event signal and event wait. Basically the last (signalling) thread to hit the barrier yields to allow any other threads, which may have lost the race, to complete. tests/ChangeLog: * barrier3.c: Fixed. * barrier4.c: Fixed. * barrier5.c: New; proves that all threads in the group reaching the barrier wait and then resume together. Repeats the test using groups of 1 to 16 threads. Each group of threads must negotiate a large number of barriers (10000). * spin4.c: Fixed. * test.h (error_string): Modified the success (0) value.
2001-07-06Keeping ANNOUNCE up to date with code additions and fixes.rpj
2001-07-06Spinlocks and barriers fixed and working. Beta level.rpj
* spin.c: Revamped and working; included static initialiser. * barrier.c: Likewise. * condvar.c: Macro constant change; inline auto init routine. * mutex.c: Likewise. * rwlock.c: Likewise. * private.c: Add support for spinlock initialiser. * global.c: Likewise. * implement.h: Likewise. * pthread.h (PTHREAD_SPINLOCK_INITIALIZER): Fix typo. tests/ChangeLog: * spin3.c: Changed test and fixed. * spin4.c: Fixed. * barrier3.c: Fixed. * barrier4.c: Fixed.
2001-07-05Fixups to last commit.rpj
2001-07-05 * barrier.c: Remove static initialisation - irreleventrpj
for this object. * pthread.h (PTHREAD_BARRIER_INITIALIZER): Removed. * rwlock.c (pthread_rwlock_wrlock): This routine is not a cancelation point - disable deferred cancelation around call to pthread_cond_wait(). tests/ChangeLog: * spin1.c: New; testing spinlocks. * spin2.c: New; testing spinlocks. * spin3.c: New; testing spinlocks. * spin4.c: New; testing spinlocks. * barrier1.c: New; testing barriers. * barrier2.c: New; testing barriers. * barrier3.c: New; testing barriers. * barrier4.c: New; testing barriers. * GNUmakefile: Add new tests. * Makefile: Add new tests.
2001-07-05Added new routines from POSIX 1003.1j. This is alpha level code.rpj
* spin.c: New module implementing spin locks. * barrier.c: New module implementing barriers. * pthread.h (_POSIX_SPIN_LOCKS): defined. (_POSIX_BARRIERS): Defined. (pthread_spin_*): Defined. (pthread_barrier*): Defined. (PTHREAD_BARRIER_SERIAL_THREAD): Defined. * implement.h (pthread_spinlock_t_): Defined. (pthread_barrier_t_): Defined. (pthread_barrierattr_t_): Defined. * mutex.c (pthread_mutex_lock): Return with the error if an auto-initialiser initialisation fails. * nonportable.c (pthread_getprocessors_np): New; gets the number of available processors for the current process.
2001-07-03Remove typo from semaphore.c.snap-2001-07-03rpj
Update ANNOUNCE to get ready for new snapshot.
2001-07-03Undo a minor code change in condvar.c and insert commentsrpj
in instead.
2001-07-03Cosmetic changes.rpj
2001-07-012001-07-01 Ross Johnson <rpj@setup1.ise.canberra.edu.au>rpj
Contributed by - Alexander Terekhov. * condvar.c: Fixed lost signal bug reported by Timur Aydin (taydin@snet.net). [RPJ (me) didn't translate the original algorithm correctly.] * semaphore.c: Added sem_post_multiple; this is a useful routine, but it doesn't appear to be standard. For now it's not an exported function.
2001-07-012001-07-01 Ross Johnson <rpj@setup1.ise.canberra.edu.au>rpj
Contributed by - Alexander Terekhov. * condvar.c: Fixed lost signal bug reported by Timur Aydin (taydin@snet.net). [RPJ (me) didn't translate the original algorithm correctly.] * semaphore.c: Added sem_post_multiple; this is a useful routine, but it doesn't appear to be standard. For now it's not an exported function. tests/ChangeLog: 2001-07-01 Ross Johnson <rpj@special.ise.canberra.edu.au> * benchtest3.c: New; timing mutexes. * benchtest4.c: New; time mutexes. * condvar3_1.c: Fixed bug - Alexander Terekhov * condvar3_3.c: New test. 2001-06-25 Ross Johnson <rpj@special.ise.canberra.edu.au> * priority1.c: New test. * priority2.c: New test. * inherit1.c: New test. * benchtest1.c: New; timing mutexes. * benchtest2.c: New; timing mutexes. * mutex4.c: Modified to test all mutex types.
2001-07-012001-06-25 Ross Johnson <rpj@setup1.ise.canberra.edu.au>rpj
* create.c (pthread_create): Add priority inheritance attributes. * mutex.c (pthread_mutex_lock): Remove some overhead for PTHREAD_MUTEX_NORMAL mutex types. Specifically, avoid calling pthread_self() and pthread_equal() to check/set the mutex owner. Introduce a new pseudo owner for this type. Test results suggest increases in speed of up to 90% for non-blocking locks. This is the default type of mutex used internally by other synchronising objects, ie. condition variables and read-write locks. The test rwlock7.c shows about a 30-35% speed increase over snapshot 2001-06-06. The price of this is that the application developer must ensure correct behaviour, or explicitly set the mutex to a safer type such as PTHREAD_MUTEX_ERRORCHECK. For example, PTHREAD_MUTEX_NORMAL (or PTHREAD_MUTEX_DEFAULT) type mutexes will not return an error if a thread which is not the owner calls pthread_mutex_unlock. The call will succeed in unlocking the mutex if it is currently locked, but a subsequent unlock by the true owner will then fail with EPERM. This is however consistent with some other implementations. (pthread_mutex_unlock): Likewise. (pthread_mutex_trylock): Likewise. (pthread_mutex_destroy): Likewise. * attr.c (pthread_attr_init): PTHREAD_EXPLICIT_SCHED is the default inheritance attribute; THREAD_PRIORITY_NORMAL is the default priority for new threads. * sched.c (pthread_attr_setschedpolicy): Added routine. (pthread_attr_getschedpolicy): Added routine. (pthread_attr_setinheritsched): Added routine. (pthread_attr_getinheritsched): Added routine. * pthread.h (sched_rr_set_interval): Added as a macro; returns -1 with errno set to ENOSYS. 2001-06-23 Ross Johnson <rpj@setup1.ise.canberra.edu.au> *sched.c (pthread_attr_setschedparam): Add priority range check. (sched_setscheduler): New function; checks for a valid pid and policy; checks for permission to set information in the target process; expects pid to be a Win32 process ID, not a process handle; the only scheduler policy allowed is SCHED_OTHER. (sched_getscheduler): Likewise, but checks for permission to query. * pthread.h (SCHED_*): Moved to sched.h as defined in the POSIX standard. * sched.h (SCHED_*): Moved from pthread.h. (pid_t): Defined if necessary. (sched_setscheduler): Defined. (sched_getscheduler): Defined. * pthread.def (sched_setscheduler): Exported. (sched_getscheduler): Likewise. 2001-06-23 Ross Johnson <rpj@setup1.ise.canberra.edu.au> Contributed by - Ralf Brese <Ralf.Brese@pdb4.siemens.de> * create.c (pthread_create): Set thread priority from thread attributes.
2001-06-19 * Made organisational-only changes to UWIN additions.rpj
* dll.c (dllMain): Moved UWIN process attach code to pthread_win32_process_attach_np(); moved instance of pthread_count to global.c. * global.c (pthread_count): Moved from dll.c. * nonportable.c (pthread_win32_process_attach_np): Moved _UWIN code to here from dll.c. * implement.h (pthread_count): Define extern int. * create.c (pthread_count): Remove extern int. * private.c (pthread_count): Likewise. * exit.c (pthread_count): Likewise. Contributed by - David Korn <dgk@research.att.com> * dll.c: Added changes necessary to work with UWIN. * create.c: Likewise. * pthread.h: Likewise. * misc.c: Likewise. * exit.c: Likewise. * private.c: Likewise. * implement.h: Likewise. There is some room at the start of struct pthread_t_ to implement the signal semantics in UWIN's posix.dll although this is not yet complete. * Nmakefile: Compatible with UWIN's Nmake utility. * Nmakefile.tests: Likewise - for running the tests.
2001-06-11 * semaphore.h (sem_t): Fixed for compile and test.rpj
* implement.h (sem_t_): Likewise. * semaphore.c: Likewise. * private.c (ptw32_sem_timedwait): Updated to use new opaque sem_t. tests/ * mutex5.c: Insert inert change to quell compiler warnings. * condvar3_2.c: Remove unused variable.
2001-06-07 * semaphore.h (sem_t): Is now an opaque pointer;rpj
moved actual definition to implement.h. * implement.h (sem_t_): Move here from semaphore.h; was the definition of sem_t. * semaphore.c: Wherever necessary, changed use of sem from that of a pointer to a pointer-pointer; added extra checks for a valid sem_t; NULL sem_t when it is destroyed; added extra checks when creating and destroying sem_t elements in the NEED_SEM code branches; changed from using a pthread_mutex_t ((*sem)->mutex) to CRITICAL_SECTION ((*sem)->sem_lock_cs) in NEED_SEM branches for access serialisation.
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