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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_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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* 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>
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* private.c (_pthread_sem_timedwait): Move from semaphore.c.
* semaphore.c : Remove redundant #includes.
(_pthread_sem_timedwait): Move to private.c.
(sem_wait): Add missing abstime arg to pthreadCancelableWait() call.
1999-01-17 Ross Johnson <rpj@ise.canberra.edu.au>
* runtest: New script to build and run a test in the tests directory.
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* cleanup.c: Correct _cplusplus to __cplusplus wherever used.
* Makefile.in: Add CC=g++ and add -fhandle-exceptions to CFLAGS.
The derived Makefile will compile all units of the package as C++
so that those which include try/catch exception handling should work
properly. The package should compile ok if CC=gcc, however, exception
handling will not be included and thus thread cancellation, for
example, will not work.
* cleanup.c (_pthread_pop_cleanup): Add #warning to compile this
file as C++ if using a cygwin32 environment. Perhaps the whole package
should be compiled using g++ under cygwin.
* private.c (_pthread_threadStart): Change #error directive
into #warning and bracket for __CYGWIN__ and derivative compilers.
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* build.bat: Delete old binaries before compiling/linking.
Tue Jan 12 09:58:38 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* dll.c: The Microsoft compiler pragmas probably are more
appropriately protected by _MSC_VER than by _WIN32.
- Tor Lillqvist <tml@iki.fi>.
* condvar.c (pthread_cond_timedwait): Fix function description
comments.
* pthread.h: Define ETIMEDOUT. This should be returned by
pthread_cond_timedwait which is not implemented yet as of
snapshot-1999-01-04-1305. It was implemented in the older version.
The Microsoft compiler pragmas probably are more appropriately
protected by _MSC_VER than by _WIN32.
- Tor Lillqvist <tml@iki.fi>.
* pthread.def: pthread_mutex_destroy was missing from the def file
- Tor Lillqvist <tml@iki.fi>.
* condvar.c (pthread_cond_broadcast): Ensure we only wait on threads
if there were any waiting on the condition.
I think pthread_cond_broadcast should do the WaitForSingleObject
only if cv->waiters > 0? Otherwise it seems to hang, at least in the
testg thread program from glib.
- Tor Lillqvist <tml@iki.fi>.
* semaphore.c (sem_post): Correct typo in comment.
Mon Jan 11 20:33:19 1999 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* pthread.h: Re-arrange conditional compile of pthread_cleanup-*
macros.
* cleanup.c (_pthread_push_cleanup): Provide conditional
compile of cleanup->prev.
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now use exception handling to implement thread cancellation. The MSC compiler
appears to know about __try/__except blocks, but gcc (ie. the GNU ANSI C
compiler) doesn't know about the equivalent C++ try/catch blocks. This should
not be a problem since gcc and g++ are nearly always available together. Some
file names may need to change in the CVS repository however.
Tue Jan 5 16:33:04 1999 Ross Johnson <rpj@swan.canberra.edu.au>
* cleanup.c (_pthread_pop_cleanup): Add C++ version of __try/__except
block. Move trailing "}" out of #ifdef _WIN32 block left there by
(my) mistake.
* private.c: Remove #include <errno.h> which is included by pthread.h.
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This will be tagged as snapshot-1999-01-04-1305
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that hadn't been checked in. Those are to finish off the original TSD management
scheme which will now start to be replaced by John Bossom's implementation.
Anders' description of his changes:-
Fixes the problem with
`TryEnterCriticalSection' on w95 systems. Instead
of directly calling `TryEnterCriticalSection' it
tries to get a pointer at DLL startup and only calls
the function if it exists. See ChangeLog for things
changed.
1998-12-05 Anders Norlander <anorland@hem2.passagen.se>
* implement.h (_pthread_try_enter_critical_section): New extern
* dll.c (_pthread_try_enter_critical_section): New pointer to
TryEnterCriticalSection if it exists; otherwise NULL.
* dll.c (PthreadsEntryPoint):
Initialize _pthread_try_enter_critical_section at startup
and release kernel32 handle when DLL is being unloaded.
* mutex.c (pthread_mutex_trylock): Replaced check for NT with
a check if _pthread_try_enter_critical_section is valid
pointer to a function. Call _pthread_try_enter_critical_section
instead of TryEnterCriticalSection to avoid errors on Win95.
Sun Nov 15 21:24:06 1998 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* cleanup.c (_pthread_destructor_run_all): Declare missing void * arg.
Fixup CVS merge conflicts.
Fri Oct 30 15:15:50 1998 Ross Johnson <rpj@swan.canberra.edu.au>
* cleanup.c (_pthread_handler_push): Fixed bug appending new
handler to list reported by Peter Slacik
<Peter.Slacik@leibinger.freinet.de>.
(new_thread): Rename poorly named local variable to
"new_handler".
Sat Oct 24 18:34:59 1998 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* global.c: Add TSD key management array and index declarations.
* implement.h: Ditto for externs.
Fri Oct 23 00:08:09 1998 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* implement.h (_PTHREAD_TSD_KEY_REUSE): Add enum.
* private.c (_pthread_delete_thread): Add call to
_pthread_destructor_run_all() to clean up the threads keys.
* cleanup.c (_pthread_destructor_run_all): Check for no more dirty
keys to run destructors on. Assume that the destructor call always
succeeds and set the key value to NULL.
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* private.c (_pthread_new_thread): Remove init of destructorstack.
No longer an element of pthread_t.
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* private.c (_pthread_new_thread): Increment _pthread_threads_count.
(_pthread_delete_thread): Decrement _pthread_threads_count.
Remove some comments.
* exit.c (_pthread_exit): : Fix two pthread_mutex_lock() calls that
should have been pthread_mutex_unlock() calls.
(_pthread_vacuum): Remove call to _pthread_destructor_pop_all().
* create.c (pthread_create): Fix two pthread_mutex_lock() calls that
should have been pthread_mutex_unlock() calls.
* global.c (_pthread_tsd_mutex): Add mutex for TSD operations.
* tsd.c (pthread_key_create): Add critical section.
(pthread_setspecific): Ditto.
(pthread_getspecific): Ditto.
(pthread_key_delete): Ditto.
* sync.c (pthread_join): Fix two pthread_mutex_lock() calls that
should have been pthread_mutex_unlock() calls.
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* {most}.c: Include <errno.h> to get POSIX error values.
* signal.c (pthread_sigmask): Only provide if HAVE_SIGSET_T is
defined.
* config.h: #undef features, don't #define them. This will be
generated by autoconf very soon.
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* private.c (_pthread_delete_thread): Fix typo. Add missing ';'.
* global.c (_pthread_virgins): Change types from pointer to
array pointer.
(_pthread_reuse): Ditto.
(_pthread_win32handle_map): Ditto.
(_pthread_threads_mutex_table): Ditto.
* implement.h(_pthread_virgins): Change types from pointer to
array pointer.
(_pthread_reuse): Ditto.
(_pthread_win32handle_map): Ditto.
(_pthread_threads_mutex_table): Ditto.
* private.c (_pthread_delete_thread): Fix "entry" should be "thread".
* misc.c (pthread_self): Add extern for _pthread_threadID_TlsIndex.
* global.c: Add comment.
* misc.c (pthread_once): Fix member -> dereferences.
Change _pthread_once_flag to once_control->flag in "if" test.
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* implement.h: Remove _pthread_find_entry() prototype.
* private.c: Extend comments.
Remove _pthread_find_entry() - no longer needed.
* create.c (_pthread_start_call): Add call to TlsSetValue() to
store the thread ID.
* dll.c (PthreadsEntryPoint): Implement. This is called
whenever a process loads the DLL. Used to initialise thread
local storage.
* implement.h: Add _pthread_threadID_TlsIndex.
Add ()s around _PTHREAD_VALID expression.
* misc.c (pthread_self): Re-implement using Win32 TLS to store
the threads own ID.
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* private.c: Corrections in comments.
(_pthread_new_thread): Alter "if" flow to be more natural.
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* cleanup.c (_pthread_handler_push): Same as below.
* create.c (pthread_create): Same as below.
* private.c (_pthread_new_thread): Rename "new" to "new_thread".
Since when has a C programmer been required to know C++?
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* implement.h: Add _PTHREAD_VALID macro.
* sync.c (pthread_join): Modify to use the new thread
type and _pthread_delete_thread(). Rename "target" to "thread".
Remove extra local variable "target".
(pthread_detach): Ditto.
* signal.c (pthread_sigmask): Move init of "us" out of inner block.
Fix instance of "this" should have been "us". Rename "us" to "thread".
* sched.c (pthread_setschedparam): Modify to use the new thread
type.
(pthread_getschedparam): Ditto.
* private.c (_pthread_find_thread): Fix return type and arg.
* implement.h: Remove _PTHREAD_YES and _PTHREAD_NO.
(_pthread_new_thread): Add prototype.
(_pthread_find_thread): Ditto.
(_pthread_delete_thread): Ditto.
(_pthread_new_thread_entry): Remove prototype.
(_pthread_find_thread_entry): Ditto.
(_pthread_delete_thread_entry): Ditto.
( _PTHREAD_NEW, _PTHREAD_INUSE, _PTHREAD_EXITED, _PTHREAD_REUSE):
Add.
* create.c (pthread_create): Minor rename "us" to "new" (I need
these cues but it doesn't stop me coming out with some major bugs
at times).
Load start_routine and arg into the thread so the wrapper can
call it.
* exit.c (pthread_exit): Fix pthread_this should be pthread_self.
* cancel.c (pthread_setcancelstate): Change
_pthread_threads_thread_t * to pthread_t and init with
pthread_this().
(pthread_setcanceltype): Ditto.
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* private.c: Added detailed explanation of the new thread
allocation scheme.
(_pthread_new_thread): Totally rewritten to use
new thread allocation scheme.
(_pthread_delete_thread): Ditto.
(_pthread_find_thread): Obsolete.
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* create.c (pthread_create): Start of rewrite. Not completed yet.
* private.c (_pthread_new_thread_entry): Start of rewrite. Not
complete.
* implement.h (_pthread_threads_thread): Rename, remove thread
member, add win32handle and ptstatus members.
(_pthread_t): Add.
* pthread.h: pthread_t is no longer mapped directly to a Win32
HANDLE type. This is so we can let the Win32 thread terminate and
reuse the HANDLE while pthreads holds it's own thread ID until
the last waiting join exits.
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* private.c (_pthread_delete_thread_entry): Destroy the thread
entry attribute object before deleting the thread entry itself.
* attr.c (pthread_attr_init): Initialise cancel_pending = FALSE.
(pthread_attr_setdetachstate): Rename "detached" to "detachedstate".
(pthread_attr_getdetachstate): Ditto.
* exit.c (_pthread_exit): Fix incorrect check for detachedstate.
* implement.h (_pthread_call_t): Remove env member.
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* private.c (_pthread_delete_thread_entry): Mutex locks removed.
Mutexes must be applied at the caller level.
(_pthread_new_thread_entry): Ditto.
(_pthread_new_thread_entry): Init cancelstate, canceltype, and
cancel_pending to default values.
(_pthread_new_thread_entry): Rename "this" to "new".
(_pthread_find_thread_entry): Rename "this" to "entry".
(_pthread_delete_thread_entry): Rename "thread_entry" to "entry".
* create.c (_pthread_start_call): Mutexes changed to
_pthread_count_mutex. All access to the threads table entries is
under the one mutex. Otherwise chaos reigns.
Sat Jul 25 23:16:51 1998 Ross Johnson <rpj@ixobrychus.canberra.edu.au>
* implement.h (_pthread_threads_thread): Move cancelstate and
canceltype members out of pthread_attr_t into here.
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* create.c (_pthread_start_call): Set thread priority. Ensure our
thread entry is removed from the thread table but only if
pthread_detach() was called and there are no waiting joins.
(pthread_create): Set detach flag in thread entry if the
thread is created PTHREAD_CREATE_DETACHED.
* pthread.h (pthread_attr_t): Rename member "detachedstate".
* attr.c (pthread_attr_init): Rename attr members.
* exit.c (pthread_exit): Fix indirection mistake.
* implement.h (_PTHREAD_THREADS_TABLE_INDEX): Add.
* exit.c (_pthread_vacuum): Fix incorrect args to
_pthread_handler_pop_all() calls.
Make thread entry removal conditional.
* sync.c (pthread_join): Add multiple join and async detach handling.
* implement.h (_PTHREAD_THREADS_TABLE_INDEX): Add.
* global.c (_pthread_threads_mutex_table): Add.
* implement.h (_pthread_once_flag): Remove.
(_pthread_once_lock): Ditto.
(_pthread_threads_mutex_table): Add.
* global.c (_pthread_once_flag): Remove.
(_pthread_once_lock): Ditto.
* sync.c (pthread_join): Fix tests involving new return value
from _pthread_find_thread_entry().
(pthread_detach): Ditto.
* private.c (_pthread_find_thread_entry): Failure return code
changed from -1 to NULL.
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pthread_exit() to use.
* private.c (_pthread_new_thread_entry): Initialise joinvalueptr to
NULL.
* create.c (_pthread_start_call): Rewrite to facilitate joins.
pthread_exit() will do a longjmp() back to here. Does appropriate
cleanup and exit/return from the thread.
(pthread_create): _beginthreadex() now passes a pointer to our
thread table entry instead of just the call member of that entry.
* implement.h (_pthread_threads_thread): New member
void ** joinvalueptr.
(_pthread_call_t): New member jmpbuf env.
* exit.c (pthread_exit): Major rewrite to handle joins and handing
value pointer to joining thread. Uses longjmp() back to
_pthread_start_call().
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* attr.c (pthread_attr_destroy): Fix merge conflicts.
(pthread_attr_getdetachstate): Fix merge conflicts.
(pthread_attr_setdetachstate): Fix merge conflicts.
* pthread.h: Fix merge conflicts.
* sync.c (pthread_join): Fix merge conflicts.
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* create.c (pthread_create): Arg to _pthread_new_thread_entry()
changed. See next entry. Move mutex locks out. Changes made yesterday
and today allow us to start the new thread running rather than
temporarily suspended.
* private.c (_pthread_new_thread_entry): _pthread_thread_table
was changed back to a table of thread structures rather than pointers.
As such we're trading storage for increaded speed. This routine
was modified to work with the new table. Mutex lock put in around
global data accesses.
(_pthread_find_thread_entry): Ditto
(_pthread_delete_thread_entry): Ditto
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* attr.c, implement.h, pthread.h, ChangeLog: Resolve CVS merge
conflicts.
* private.c (_pthread_find_thread_entry): Changes to return type
to support leaner _pthread_threads_table[] which now only stores
_pthread_thread_thread_t *.
(_pthread_new_thread_entry): Internal changes.
(_pthread_delete_thread_entry): Internal changes to avoid contention.
Calling routines changed accordingly.
* pthread.h: Modified cleanup macros to use new generic push and pop.
Added destructor and atfork stacks to _pthread_threads_thread_t.
* cleanup.c (_pthread_handler_push, _pthread_handler_pop,
_pthread_handler_pop_all): Renamed cleanup push and pop routines
and made generic to handle destructors and atfork handlers as
well.
* create.c (_pthread_start_call): New function is a wrapper for
all new threads. It allows us to do some cleanup when the thread
returns, ie. that is otherwise only done if the thread is cancelled.
* exit.c (_pthread_vacuum): New function contains code from
pthread_exit() that we need in the new _pthread_start_call()
as well.
* implement.h: Various additions and minor changes.
* pthread.h: Various additions and minor changes.
Change cleanup handler macros to use generic handler push and pop
functions.
* attr.c: Minor mods to all functions.
(is_attr): Implemented missing function.
* create.c (pthread_create): More clean up.
* private.c (_pthread_find_thread_entry): Implement.
(_pthread_delete_thread_entry): Implement.
(_pthread_new_thread_entry): Implement.
These functions manipulate the implementations internal thread
table and are part of general code cleanup and modularisation.
They replace _pthread_getthreadindex() which was removed.
* exit.c (pthread_exit): Changed to use the new code above.
* pthread.h: Add cancelability constants. Update comments.
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* cleanup.c (_pthread_cleanup_push): Implement.
(_pthread_cleanup_pop): Implement.
(_pthread_do_cancellation): Implement.
These are private to the implementation. The real cleanup functions
are macros. See below.
* pthread.h (pthread_cleanup_push): Implement as a macro.
(pthread_cleanup_pop): Implement as a macro.
Because these are macros which start and end a block, the POSIX scoping
requirement is observed. See the comment in the file.
* exit.c (pthread_exit): Refine the code.
* create.c (pthread_create): Code cleanup.
* implement.h (RND_SIZEOF): Add RND_SIZEOF(T) to round sizeof(T)
up to multiple of DWORD.
Add function prototypes.
* private.c (_pthread_getthreadindex): "*thread" should have been
"thread". Detect empty slot fail condition.
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* private.c (_pthread_getthreadindex): Implement.
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