Age | Commit message (Collapse) | Author |
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* Makefile: Remove inconsistencies in 'cl' args
- Erik Hensema <erik.hensema@group2000.nl>
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- asynchronous cancellation added
- attempt to hide internal exceptions from applications
- kernel32 load/free problem fixed
- new tests
- changes only to comments in some tests
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(ETIMEDOUT): Change fallback value to that defined by winsock.h.
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* general: Patched for portability to WinCE. The details are
described in the file WinCE-PORT. Follow the instructions
in README.WinCE to make the appropriate changes in config.h.
- Tristan Savatier <tristan@mpegtv.com>
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1999-10-30 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* create.c (pthread_create): Explicitly initialise thread state to
default values.
* cancel.c (pthread_setcancelstate): Check for NULL 'oldstate'
for compatibility with Solaris pthreads;
(pthread_setcanceltype): ditto:
- Erik Hensema <erik.hensema@group2000.nl>
1999-10-23 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* pthread.h (ctime_r): Fix incorrect argument "_tm"
- Erik Hensema <erik.hensema@group2000.nl>
tests/ChangeLog:
1999-10-30 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* cancel1.c: New. Test pthread_setcancelstate and
pthread_setcanceltype functions.
* eyal1.c (waste_time): Change calculation to avoid FP exception
on Aplhas
- Rich Peters <rpeters@micro-magic.com>
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* pthread.h (_POSIX_THREADS): Only define it if it isn't
already defined. Projects may need to define this on
the CC command line under Win32 as it doesn't have unistd.h
- Aurelio Medina <aureliom@crt.com>
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* rwlock.c (pthread_rwlock_destroy): Add cast to remove compile
warning.
* condvar.c (pthread_cond_broadcast): Only release semaphores
if there are waiting threads.
1999-10-15 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* condvar.c (cond_wait_cleanup): New static cleanup handler for
cond_timedwait;
(cond_timedwait): pthread_cleanup_push args changed;
canceling a thread while it's in pthread_cond_wait
will now decrement the waiters count and cleanup if it's the
last waiter.
- Lorin Hochstein <lmh@xiphos.ca> and
Peter Slacik <Peter.Slacik@tatramed.sk>;
the last waiter will now reset the CV's wasBroadcast flag
- Graham Dumpleton <Graham.Dumpleton@ra.pad.otc.telstra.com.au>.
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* rwlock.c (pthread_rwlock_destroy): Add serialisation.
(_rwlock_check_need_init): Check for detroyed rwlock.
* rwlock.c: Check return codes from _rwlock_check_need_init();
modify comments; serialise access to rwlock objects during
operations; rename rw_mutex to rw_lock.
* implement.h: Rename rw_mutex to rw_lock.
* mutex.c (pthread_mutex_destroy): Add serialisation.
(_mutex_check_need_init): Check for detroyed mutex.
* condvar.c (pthread_cond_destroy): Add serialisation.
(_cond_check_need_init): Check for detroyed condvar.
* mutex.c: Modify comments.
* condvar.c: Modify comments.
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The following code for POSIX read/write locks was contributed
by Aurelio Medina.
* implement.h (pthread_rwlock_t_): Add.
* pthread.h (pthread_rwlock_t): Add.
(PTHREAD_RWLOCK_INITIALIZER): Add.
Add rwlock function prototypes.
* rwlock.c: New module.
* pthread.def: Add new rwlock functions.
* private.c (_pthread_processInitialize): initialise
_pthread_rwlock_test_init_lock critical section.
* global.c (_pthread_rwlock_test_init_lock): Add.
* mutex.c (pthread_mutex_destroy): Don't free mutex memory
if mutex is PTHREAD_MUTEX_INITIALIZER and has not been
initialised yet.
tests/ChangeLog
Sep 15 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* rwlock1.c: New test.
* rwlock2.c: New test.
* rwlock3.c: New test.
* rwlock4.c: New test.
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* mutex.c (pthread_mutex_destroy): Don't free mutex memory
if mutex is PTHREAD_MUTEX_INITIALIZER and has not been
initialised yet.
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* mutex.c (pthread_mutex_destroy): Free mutex memory.
- Milan Gardian <mg@tatramed.sk>
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* exit.c (pthread_exit): Fix reference to potentially
uninitialised pointer.
1999-08-21 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* private.c (_pthread_threadStart): Apply fix of 1999-08-19
this time to C++ and non-trapped C versions. Ommitted to
do this the first time through.
tests/ChangeLog:
Aug 22 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* runall.bat (join2): Add test.
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* private.c (_pthread_threadStart): Return exit status from
the application thread startup routine.
- Milan Gardian <mg@tatramed.sk>
1999-08-18 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* exit.c (pthread_exit): Put status into pthread_t->exitStatus
- John Bossom <john.Bossom@cognos.com>
* private.c (_pthread_threadStart): Set pthread->exitStatus
on exit of try{} block.
- John Bossom <john.Bossom@cognos.com>
* sync.c (pthread_join): use pthread_exitStatus value if the
thread exit doesn't return a value (for Mingw32 CRTDLL
which uses endthread instead of _endthreadex).
- John Bossom <john.Bossom@cognos.com>
Tue Aug 17 20:17:58 CDT 1999 Mumit Khan <khan@xraylith.wisc.edu>
* create.c (pthread_create): Add CRTDLL suppport.
* exit.c (pthread_exit): Likewise.
* private.c (_pthread_threadStart): Likewise.
(_pthread_threadDestroy): Likewise.
* sync.c (pthread_join): Likewise.
* tests/join1.c (main): Warn about partial support for CRTDLL.
Tue Aug 17 20:00:08 1999 Mumit Khan <khan@xraylith.wisc.edu>
* Makefile.in (LD): Delete entry point.
* acconfig.h (STDCALL): Delete unused macro.
* configure.in: Remove test for STDCALL.
* config.h.in: Regenerate.
* errno.c (_errno): Fix self type.
* pthread.h (PT_STDCALL): Move from here to
* implement.h (PT_STDCALL): here.
(_pthread_threadStart): Fix prototype.
* private.c (_pthread_threadStart): Likewise.
1999-08-14 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* exit.c (pthread_exit): Don't call pthread_self() but
get thread handle directly from TSD for efficiency.
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* exit.c (pthread_exit): Don't call pthread_self() but
get thread handle directly for efficiency.
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1999-08-12 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* private.c (_pthread_threadStart): ei[] only declared if _MSC_VER.
tests/ChangeLog:
Wed Aug 12 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* Makefile (LIBS): Add -L.
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* semaphore.h (mode_t): Conditionally typedef it.
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Sat May 8 09:42:30 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* pthread.def (sem_open): Add.
(sem_close): Add.
(sem_unlink): Add.
(sem_getvalue): Add.
* FAQ (Question 3): Add.
Thu Apr 8 01:16:23 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* semaphore.c (sem_open): New function; returns an error (ENOSYS).
(sem_close): ditto.
(sem_unlink): ditto.
(sem_getvalue): ditto.
* semaphore.h (_POSIX_SEMAPHORES): define.
./tests/ChangeLog
Sat May 29 23:29:04 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* runall.bat (condvar5): Add new test.
* runall.bat (condvar6): Add new test.
* Makefile (condvar5) : Add new test.
* Makefile (condvar6) : Add new test.
* condvar5.c: New test for pthread_cond_broadcast().
* condvar6.c: New test for pthread_cond_broadcast().
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* condvar.c (pthread_cond_broadcast): Fix possible memory fault
- Mark E. Armstrong <avail@pacbell.net>
Thu May 27 13:08:46 1999 Ross Johnson <rpj@swan.canberra.edu.au>
* condvar.c (pthread_cond_broadcast): Fix logic bug
- Peter Slacik <Peter.Slacik@tatramed.sk>;
optimise sem_post loop
- Bossom, John <John.Bossom@Cognos.COM>.
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* attr.c (pthread_attr_setdetachstate): Fix logic bug.
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* errno.c (_REENTRANT || _MT): Invert #if condition.
* pthread.h (_errno): Conditionally include prototype.
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* *.c (comments): Remove individual attributions - these are
documented sufficiently elsewhere.
* implement.h (pthread.h): Remove extraneous include.
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Sun Apr 4 11:05:57 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* sched.c (sched.h): Include.
* sched.h: New file for POSIX 1b scheduling.
* pthread.h: Move opaque structures to implement.h; move sched_*
prototypes out and into sched.h.
* implement.h: Add opaque structures from pthread.h.
* sched.c (sched_yield): New function.
* condvar.c (_pthread_sem_*): Rename to sem_*; except for
_pthread_sem_timedwait which is an private function.
Sat Apr 3 23:28:00 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* Makefile.in (OBJS): Add errno.o.
Fri Apr 2 11:08:50 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* implement.h (_pthread_sem_*): Remove prototypes now defined in
semaphore.h.
* pthread.h (sempahore.h): Include.
* semaphore.h: New file for POSIX 1b semaphores.
* pthread.h (_pthread_sem_t): Change to sem_t.
* semaphore.c (_pthread_sem_*): Change to sem_*; these functions
will be exported from the library; set errno on error.
- John Bossom <jebossom@cognos.com>
(_pthread_sem_timedwait): Moved to private.c.
* private.c (_pthread_sem_timedwait): Moved from semaphore.c;
set errno on error.
* errno.c (_errno): New file. New function.
- John Bossom
* pthread.h (pthread_t_): Add per-thread errno element.
tests/ChangeLog
Sun Apr 4 12:04:28 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* tsd1.c (mythread): Change Sleep(0) to sched_yield().
(sched.h): Include.
* condvar3.c (mythread): Remove redundant Sleep().
* runtest.bat: Re-organised to make more informative.
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* semaphore.c (_pthread_sem_timedwait): Check for negative
milliseconds.
- Tor Lillqvist <tml@iki.fi>
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* misc.c (CancelableWait): Initialise exceptionInformation[2].
(pthread_self): Get a real Win32 thread handle for implicit threads.
* cancel.c (pthread_testcancel): Initialise exceptionInformation[2].
* implement.h (SE_INFORMATION): Fix values.
* private.c (_pthread_threadDestroy): Close the thread handle.
Fri Mar 19 12:57:27 1999 Ross Johnson <rpj@swan.canberra.edu.au>
* cancel.c (comments): Update and cleanup.
Fri Mar 19 09:12:59 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* private.c (_pthread_threadStart): status returns PTHREAD_CANCELED.
* pthread.h (PTHREAD_CANCELED): defined.
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Fri Mar 19 09:12:59 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* private.c (_pthread_threadStart): status returns PTHREAD_CANCELED.
* pthread.h (PTHREAD_CANCELED): defined.
==> tests/ChangeLog <==
Fri Mar 19 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* *.bat: redirect unwanted output to nul:
* runall.bat: new.
* cancel1.c: new. Not part of suite yet.
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* all: Add GNU LGPL and Copyright and Warranty.
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* condvar.c (pthread_cond_init): fix possible uninitialised use
of cv.
Sun Mar 14 21:01:59 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* condvar.c (pthread_cond_destroy): don't do full cleanup if
static initialised cv has never been used.
(cond_timedwait): check result of auto-initialisation.
tests/ChangeLog
Mon Mar 15 00:17:55 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* mutex1.c: only test mutex init and destroy; add assertions.
* count1.c: raise number of spawned threads to 60 (appears to
be the limit under Win98).
Sun Mar 14 21:31:02 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* test.h (assert): add assertion trace option.
Use:
"#define ASSERT_TRACE 1" to turn it on,
"#define ASSERT_TRACE 0" to turn it off (default).
* condvar3.c (main): add more assertions.
* condvar4.c (main): add more assertions.
* condvar1.c (main): add more assertions.
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* pthread.h (pthread_mutex_t): revert to (pthread_mutex_t *);
define a value to serve as PTHREAD_MUTEX_INITIALIZER.
(pthread_mutex_t_): remove staticinit and valid elements.
(pthread_cond_t): revert to (pthread_cond_t_ *);
define a value to serve as PTHREAD_COND_INITIALIZER.
(pthread_cond_t_): remove staticinit and valid elements.
* mutex.c (pthread_mutex_t args): adjust indirection of references.
(all functions): check for PTHREAD_MUTEX_INITIALIZER value;
check for NULL (invalid).
* condvar.c (pthread_cond_t args): adjust indirection of references.
(all functions): check for PTHREAD_COND_INITIALIZER value;
check for NULL (invalid).
Wed Mar 10 17:18:12 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* misc.c (CancelableWait): Undo changes from Mar 8 and 7.
tests/ChangeLog
Fri Mar 12 08:34:15 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* eyal1.c (main): Fix trylock loop; was not waiting for thread to lock
the "started" mutex.
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* misc.c (CancelableWait): Ensure cancelEvent handle is the lowest
indexed element in the handles array. Enhance test for abandoned
objects.
* pthread.h (PTHREAD_MUTEX_INITIALIZER): Trailing elements not
initialised are set to zero by the compiler. This avoids the
problem of initialising the opaque critical section element in it.
(PTHREAD_COND_INITIALIZER): Ditto.
* semaphore.c (_pthread_sem_timedwait): Check sem == NULL earlier.
Sun Mar 7 12:31:14 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* condvar.c (pthread_cond_init): set semaphore initial value
to 0, not 1. cond_timedwait was returning signaled immediately.
* misc.c (CancelableWait): Place the cancel event handle first
in the handle table for WaitForMultipleObjects. This ensures that
the cancel event is recognised and acted apon if both objects
happen to be signaled together.
* private.c (_pthread_cond_test_init_lock): Initialise and destroy.
* implement.h (_pthread_cond_test_init_lock): Add extern.
* global.c (_pthread_cond_test_init_lock): Add declaration.
* condvar.c (pthread_cond_destroy): check for valid initialised CV;
flag destroyed CVs as invalid.
(pthread_cond_init): pthread_cond_t is no longer just a pointer.
This is because PTHREAD_COND_INITIALIZER needs state info to reside
in pthread_cond_t so that it can initialise on first use. Will work on
making pthread_cond_t (and other objects like it) opaque again, if
possible, later.
(cond_timedwait): add check for statically initialisation of
CV; initialise on first use.
(pthread_cond_signal): check for valid CV.
(pthread_cond_broadcast): check for valid CV.
(_cond_check_need_init): Add.
* pthread.h (PTHREAD_COND_INITIALIZER): Fix.
(pthread_cond_t): no longer a pointer to pthread_cond_t_.
(pthread_cond_t_): add 'staticinit' and 'valid' elements.
tests/ChangeLog
Sun Mar 7 10:41:52 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* Makefile (condvar3, condvar4): Add tests.
* condvar4.c (General): Reduce to simple test case; prerequisite
is condvar3.c; add description.
* condvar3.c (General): Reduce to simple test case; prerequisite
is condvar2.c; add description.
* condvar2.c (General): Reduce to simple test case; prerequisite
is condvar1.c; add description.
* condvar1.c (General): Reduce to simple test case; add
description.
* Template.c (Comments): Add generic test detail.
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* pthread.h (PTHREAD_MUTEX_INITIALIZER): missing braces around
cs element initialiser.
Bring some tests up-to-date.
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* pthread.h (pthread_exit): The return type of this function is
void, not int.
* exit.c (pthread_exit): Do not return 0.
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* dll.c (DLLMain): Expand TryEnterCriticalSection support test.
* mutex.c (pthread_mutex_trylock): The check for
_pthread_try_enter_critical_section == NULL should have been
removed long ago.
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* sync.c (pthread_join): Fix pthread_equal() test.
* mutex.c (pthread_mutex_trylock): Check mutex != NULL before
using it.
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* misc.c (pthread_equal): Fix inverted result.
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* Makefile.in: Use libpthread32.a as the name of the DLL export
library instead of pthread.lib.
* condvar.c (pthread_cond_init): cv could have been used unitialised;
initialise.
* create.c (pthread_create): parms could have been used unitialised;
initialise.
Add "Makefile" for people who don't want to (or can't) run ./configure.
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* pthread.h (struct pthread_once_t_): Remove redefinition.
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* pthread.h (struct pthread_once_t_): Replaced.
* misc.c (pthread_once): Replace with John Bossom's version;
has lighter weight serialisation; fixes problem of not holding
competing threads until after the init_routine completes.
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* misc.c (CancelableWait): Change C++ exception throw.
* sync.c (pthread_join): Change FIXME comment - issue resolved.
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* configure: Various temporary changes.
- Kevin Ruland <Kevin.Ruland@anheuser-busch.com>
* README: Update.
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* pthread.def (pthread_attr_getstackaddr): uncomment
(pthread_attr_setstackaddr): uncomment
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* global.c: Remove Pthread_exception instantiation.
* cancel.c (pthread_testcancel): Change C++ exception throw.
* implement.h: Remove extern declaration.
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* semaphore.c: Comment format changes.
Wed Feb 3 13:04:44 1999 Ross Johnson <rpj@swan.canberra.edu.au>
* cleanup.c: Rename _pthread_*_cleanup() to pthread_*_cleanup().
* pthread.def: Ditto.
* pthread.h: Ditto.
* pthread.def (pthread_cleanup_push): Remove from export list;
the function is defined as a macro under all compilers.
(pthread_cleanup_pop): Ditto.
* pthread.h: Remove #if defined().
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* sync.c (pthread_join): Check for NULL value_ptr arg;
check for detached threads.
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Tue Feb 2 18:07:43 1999 Ross Johnson <rpj@swan.canberra.edu.au>
* implement.h: Add #include <pthread.h>.
Change sem_t to _pthread_sem_t.
Various patches by Kevin Ruland <Kevin.Ruland@anheuser-busch.com>
* signal.c (pthread_sigmask): Add and modify casts.
Reverse LHS/RHS bitwise assignments.
* pthread.h: Remove #include <semaphore.h>.
(_PTHREAD_ATTR_VALID): Add cast.
(struct pthread_t_): Add sigmask element.
* dll.c: Add "extern C" for DLLMain.
(DllMain): Add cast.
* create.c (pthread_create): Set sigmask in thread.
* condvar.c: Remove #include. Change sem_* to _pthread_sem_*.
* attr.c: Changed #include.
* Makefile.in: Additional targets and changes to build the library
as a DLL.
Fri Jan 29 11:56:28 1999 Ross Johnson <rpj@swan.canberra.edu.au>
* Makefile.in (OBJS): Add semaphore.o to list.
* semaphore.c (_pthread_sem_timedwait): Move from private.c.
Rename sem_* to _pthread_sem_*.
* pthread.h (pthread_cond_t): Change type of sem_t.
_POSIX_SEMAPHORES no longer defined.
* semaphore.h: Contents moved to implement.h.
Removed from source tree.
* implement.h: Add semaphore function prototypes and ename all
functions to prepend '_pthread_'. They are
now private to the pthreads-win32 implementation.
* private.c: Change #warning.
Move _pthread_sem_timedwait() to semaphore.c.
* cleanup.c: Change #warning.
* misc.c: Remove #include <errno.h>
* pthread.def: Cleanup CVS merge conflicts.
* global.c: Ditto.
* ChangeLog: Ditto.
* cleanup.c: Ditto.
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Sun Jan 24 01:34:52 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* semaphore.c (sem_wait): Remove second arg to
pthreadCancelableWait() call.
Fri Jan 22 14:31:59 1999 Ross Johnson <rpj@swan.canberra.edu.au>
* Makefile.in (CFLAGS): Remove -fhandle-exceptions. Not needed
with egcs. Add -g for debugging.
* create.c (pthread_create): Replace __stdcall with PT_STDCALL
macro. This is a hack and must be fixed.
* misc.c (CancelableWait): Remove redundant statement.
* mutex.c (pthread_mutexattr_init): Cast calloc return value.
* misc.c (CancelableWait): Add cast.
(pthread_self): Add cast.
* exit.c (pthread_exit): Add cast.
* condvar.c (pthread_condattr_init): Cast calloc return value.
* cleanup.c: Reorganise conditional compilation.
* attr.c (pthread_attr_init): Remove unused 'result'.
Cast malloc return value.
* private.c (_pthread_callUserDestroyRoutines): Redo conditional
compilation.
* misc.c (CancelableWait): C++ version uses 'throw'.
* cancel.c (pthread_testcancel): Ditto.
* implement.h (class pthread_exception): Define for C++.
* pthread.h: Fix C, C++, and Win32 SEH condition compilation
mayhem around pthread_cleanup_* defines. C++ version now uses John
Bossom's cleanup handlers.
(pthread_attr_t): Make 'valid' unsigned.
Define '_timeb' as 'timeb' for Ming32.
Define PT_STDCALL as nothing for Mingw32. May be temporary.
* cancel.c (pthread_testcancel): Cast return value.
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* pthread.h (PTHREAD_MUTEX_AUTO_CS_NP): New.
(PTHREAD_MUTEX_FORCE_CS_NP): New.
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* README: Updated.
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* pthread.h (pthread_mutexattr_t): Changed to a pointer.
* mutex.c (pthread_mutex_init): Conditionally create Win32 mutex
- from John Bossom's implementation.
(pthread_mutex_destroy): Conditionally close Win32 mutex
- from John Bossom's implementation.
(pthread_mutexattr_init): Replaced by John Bossom's version.
(pthread_mutexattr_destroy): Ditto.
(pthread_mutexattr_getpshared): New function from John Bossom's
implementation.
(pthread_mutexattr_setpshared): New function from John Bossom's
implementation.
Tue Jan 19 18:27:42 1999 Ross Johnson <rpj@swan.canberra.edu.au>
* pthread.h (pthreadCancelableTimedWait): New prototype.
(pthreadCancelableWait): Remove second argument.
* misc.c (CancelableWait): New static function is
pthreadCancelableWait() renamed.
(pthreadCancelableWait): Now just calls CancelableWait() with
INFINITE timeout.
(pthreadCancelableTimedWait): Just calls CancelableWait()
with passed in timeout.
* private.c (_pthread_sem_timedwait): 'abstime' arg really is
absolute time. Calculate relative time to wait from current
time before passing timeout to new routine
pthreadCancelableTimedWait().
- Scott Lightner <scott@curriculum.com>
Tue Jan 19 10:27:39 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* pthread.h (pthread_mutexattr_setforcecs_np): New prototype.
* mutex.c (pthread_mutexattr_init): Init 'pshared' and 'forcecs'
attributes to 0.
(pthread_mutexattr_setforcecs_np): New function (not portable).
* pthread.h (pthread_mutex_t):
Add 'mutex' element. Set to NULL in PTHREAD_MUTEX_INITIALIZER.
The pthread_mutex_*() routines will try to optimise performance
by choosing either mutexes or critical sections as the basis
for pthread mutexes for each indevidual mutex.
(pthread_mutexattr_t_): Add 'forcecs' element.
Some applications may choose to force use of critical sections
if they know that:-
the mutex is PROCESS_PRIVATE and,
either the OS supports TryEnterCriticalSection() or
pthread_mutex_trylock() will never be called on the mutex.
This attribute will be setable via a non-portable routine.
Note: We don't yet support PROCESS_SHARED mutexes, so the
implementation as it stands will default to Win32 mutexes only if
the OS doesn't support TryEnterCriticalSection. On Win9x, and early
versions of NT 'forcecs' will need to be set in order to get
critical section based mutexes.
Sun Jan 17 12:01:26 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* pthread.h (PTHREAD_MUTEX_INITIALIZER): Init new 'staticinit'
value to '1' and existing 'valid' value to '1'.
* global.c (_pthread_mutex_test_init_lock): Add.
* implement.h (_pthread_mutex_test_init_lock.): Add extern.
* private.c (_pthread_processInitialize): Init critical section for
global lock used by _mutex_check_need_init().
(_pthread_processTerminate): Ditto (:s/Init/Destroy/).
* dll.c (dllMain): Move call to FreeLibrary() so that it is only
called once when the process detaches.
* mutex.c (_mutex_check_need_init): New static function to test
and init PTHREAD_MUTEX_INITIALIZER mutexes. Provides serialised
access to the internal state of the uninitialised static mutex.
Called from pthread_mutex_trylock() and pthread_mutex_lock() which
do a quick unguarded test to check if _mutex_check_need_init()
needs to be called. This is safe as the test is conservative
and is repeated inside the guarded section of
_mutex_check_need_init(). Thus in all calls except the first
calls to lock static mutexes, the additional overhead to lock any
mutex is a single memory fetch and test for zero.
* pthread.h (pthread_mutex_t_): Add 'staticinit' member. Mutexes
initialised by PTHREAD_MUTEX_INITIALIZER aren't really initialised
until the first attempt to lock it. Using the 'valid'
flag (which flags the mutex as destroyed or not) to record this
information would be messy. It is possible for a statically
initialised mutex such as this to be destroyed before ever being
used.
* mutex.c (pthread_mutex_trylock): Call _mutex_check_need_init()
to test/init PTHREAD_MUTEX_INITIALIZER mutexes.
(pthread_mutex_lock): Ditto.
(pthread_mutex_unlock): Add check to ensure we don't try to unlock
an unitialised static mutex.
(pthread_mutex_destroy): Add check to ensure we don't try to delete
a critical section that we never created. Allows us to destroy
a static mutex that has never been locked (and hence initialised).
(pthread_mutex_init): Set 'staticinit' flag to 0 for the new mutex.
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