LinuxThreads library.

1998-03-11 00:42  Wolfram Gloger  <wmglo@dent.med.uni-muenchen.de>
	* linuxthreads/manager.c: Enable resetting of the thread
	scheduling policy to SCHED_OTHER when the parent thread
	has a different one.
1998-02-01 13:51  Ulrich Drepper  <drepper@cygnus.com>
	* sysdeps/unix/sysv/linux/bits/posix_opt.h: Define
	_POSIX_ASYNCHRONOUS_IO.
	* sysdeps/pthread/pthread.h: Define bits for Unix98 variants of
	mutexes.
	* mutex.c: Implement new mutex types.
	* internals.h: Include <signal.h>.
	* libpthread.map: Add __erno_location and __h_errno_location.
	* errno.c: Return pointer to variable actually in use.  This might
	not be the one in the thread structure.
	* internals.h (struct _pthread_descr_struct): Add new fields p_errnop
	and p_h_errnop.
	* manager.c (__pthread_manager): Set p_errnop and p_h_errnop member
	of manager thread structure.
	(pthread_handle_create): Set p_errnop and p_h_errnop members for new
	thread.
	* pthread.c: Adapt initializer for thread structures.
	(__pthread_initial_thread): Set p_errnop and p_h_errnop member.
	(__pthread_reset_main_thread): Reset p_errnop and p_h_errnop of
	current thread to global variables.
1998-01-31 17:27  Ulrich Drepper  <drepper@cygnus.com>
	* rwlock.c: New file.
	* Makefile (libpthread-routines): Add rwlock.
	* sysdeps/pthread/pthread.h: Define data structures and declare
	functions.
	* libpthread.map: Add new functions.
1997-12-18 13:50  Philip Blundell  <pb@nexus.co.uk>
	* sysdeps/arm/pt-machine.h: New file; add ARM support.
	* sysdeps/arm/Implies: likewise.
	* README: Document it.
1997-12-13  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>
	* signals.c: Remove unneeded initializer for sigwaited, saving a
1997-04-11 01:18  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>
	* semaphore.c (sem_init): Set sem_spinlock only if available.
1997-12-04 01:48  Ulrich Drepper  <drepper@cygnus.com>
	* mutex.c: Implement PTHREAD_MUTEX_CHECKERROR.
	* sysdeps/pthread/pthread.h: Define PTHREAD_MUTEX_CHECKERROR.
	* Makefile: Update from LinuxThreads 0.7.
	* internals.h. Likewise.
	* manager.c: Likewise.
	* mutex.c: Likewise.
	* pthread.c: Likewise.
	* signals.c: Likewise.
	* specific.c: Likewise.
	* Examples/ex3.c: Likewise.
1997-11-20 18:13  Ulrich Drepper  <drepper@cygnus.com>
	* pthread.c (__pthread_reset_main_thread): Close pipe only if still
	open.
1997-10-29 05:38  Ulrich Drepper  <drepper@cygnus.com>

	* wrapsyscall.c: Add socket functions which are also cancelation
	points.

1997-10-19 21:40  Wolfram Gloger  <wg@wolfram.dent.med.uni-muenchen.de>

	* specific.c (__libc_internal_tsd_set, __libc_internal_tsd_get):
	New functions for fast thread specific data within libc.

	* internals.h: Add new array p_libc_specific to struct
	_pthread_descr_struct.

	* sysdeps/pthread/bits/libc-lock.h: Declare new functions.

1997-10-13 05:39  Ulrich Drepper  <drepper@cygnus.com>

	* semaphore.h: Add __BEGIN_DECLS/__END_DECLS.
	Reported by Ralf Corsepius <corsepiu@faw.uni-ulm.de>.

1997-08-29 03:05  Ulrich Drepper  <drepper@cygnus.com>

	* internals.h (struct _pthread_descr_struct): Add definitions for
	two-level specific key handling.
	* manager.c (pthread_handle_create): Initialize specific memory array.
	* specific.c: Implement two-level key handling.
	* weaks.c: Don't provide dummy key handling.
	* sysdeps/pthread/bits/libc-lock.h: Typedef __libc_lock_t (no #define).
	Add definition of __libc_key_t.
	* sysdeps/unix/sysv/linux/bits/local_lim.h: Define PTHREAD_KEYS_MAX
	as 1024.
	Add definition of _POSIX_THREAD_DESTRUCTOR_ITERATIONS and
	PTHREAD_DESTRUCTOR_ITERATIONS.

	* manager.c (pthread_handle_create): Compare mmap result with
	MAP_FAILED.

	* ptfork.c: Rename to __pthread_atfork and make old name a weak alias.
	* sysdeps/pthread/bits/pthread.h: Add prototype for __pthread_atfork.

1997-08-22 19:04  Richard Henderson  <rth@cygnus.com>

	sysdeps/sparc -> sysdeps/sparc/sparc32
	sysdeps/sparc64 -> sysdeps/sparc/sparc64

	* internals.h: Change definition of THREAD_SELF to be an expression,
	not a statement that did a return.
	* sysdeps/alpha/pt-machine.h (THREAD_SELF): Update accordingly.
	* sysdeps/sparc/sparc32/pt-machine.h (THREAD_SELF, INIT_THREAD_SELF):
	Follow Solaris and use a "system reserved" register (%g6) to hold
	the thread descriptor.
	* sysdeps/sparc/sparc64/pt-machine.h: Likewise.

1997-08-03 00:09  Ulrich Drepper  <drepper@cygnus.com>

	* mutex.c: Correct pthread_once.  Patch by Xavier Leroy.
	* sysdeps/pthread/pthread.h: Add prototype for __pthread_once.
	* sysdeps/pthread/bits/pthread.h: Add macros for __libc_once.

	* semaphore.c: Include spinlock.h only when needed.

	* specific.c (__pthread_setsepcific, __pthread_getspecific): Reject
	keys for entries not in use.

	* weaks.c: Implement key handling functions for real.

1997-06-29  01:04  Richard Henderson  <richard@gnu.ai.mit.edu>

	Initial sparc64-linux support:
	* linuxthreads/sysdeps/sparc64/Implies: New file.
	* linuxthreads/sysdeps/sparc64/pt-machine.h: Likewise.

1997-06-29 00:48  Ulrich Drepper  <drepper@cygnus.com>

	* semaphore.c: Include spinlock.h at correct place.
	Patch by HJ Lu.

1997-06-13 10:06  Richard Henderson  <rth@tamu.edu>

	The Great Bit File Move:
	* sysdeps/alpha/semaphorebits.h: -> .../bits/semaphore.h.
	* sysdeps/powerpc/semaphorebits.h: Likewise.
	* sysdeps/pthread/cmpxchg/semaphorebits.h: Likewise.
	* sysdeps/pthread/no-cmpxchg/semaphorebits.h: Likewise.
	* sysdeps/pthread/libc-lock.h: -> bits/
	* sysdeps/pthread/stdio-lock.h: Likewise.
	* sysdeps/unix/sysv/linux/local_lim.h: Likewise.
	* sysdeps/unix/sysv/linux/posix_opt.h: Likewise.
	* semaphore.h: Likewise.
	* sysdeps/pthread/pthread.h: Likewise.

	* lockfile.c: <foo.h> -> <bits/foo.h>.
	* semaphore.h: Likewise.

	* Makefile: (headers): foo.h -> bits/foo.h.
	* sysdeps/pthread/Makefile: Likewise.

1997-04-11 01:18  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* semaphore.c (sem_init): Set sem_spinlock only if available.

	* sysdeps/m68k/pt-machine.h (testandset, __compare_and_swap): Fix
	asm constraints.

1997-04-09 03:00  Ulrich Drepper  <drepper@cygnus.com>

	Update from LinuxThreads 0.6.

	* attr.c (pthread_attr_getdetachstate): Use __sched_get_priority_max
	and __sched_get_priority_min instead of names without `__'.

	* manager.c: Rewrite large parts to implement opaque pthread_t.

	* cancel.c: Adapt for opaque pthread_t type.
	* condvar.c: Likewise.
	* errno.c: Likewise.
	* join.c: Likewise.
	* mutex.c: Likewise.
	* pthread.c: Likewise.
	* signals.c: Likewise.
	* specific.c: Likewise.
	* restart.h: Likewise.
	* queue.h: Likewise.
	* Examples/ex3.c: Likewise.
	* Examples/ex4.c: Likewise.
	* sysdeps/pthread/pthread.h: Likewise.

	* pthread.c: Accumulate time for all threads in thread manager.

	* semaphore.c: Implement fallback implementation for architectures
	sometimes missing compare-exchange operations.

	* cancel.c (pthread_cancel): Validate handle argument.
	* join.c (pthread_join): Likewise.
	(pthread_detach): Likewise.
	* signals.c (pthread_kill): Likewise.

	* spinlock.h (acquire): Use __sched_yield not sched_yield.

	* queue.h (enqueue): Enqueue thread according to priority.

	* internals.c (struct pthread_start_args): New struct for passing
	args to cloning function.
	(struct _pthread): Rename to _pthread_descr_struct and adapt for
	opaque pthread_t.

	* Examples/Makefile (clean): Pass -f option to rm.

	* sysdeps/i386/pt-machine.h: Add check for compare-exchange instruction
	and define TEST_FOR_COMPARE_AND_SWAP.
	* sysdeps/i386/i486/pt-machine.h: Removed.

	* sysdeps/unix/sysv/linux/local_lim.h (PTHREAD_THREADS_MAX): Increase
	to 1024.

1997-04-04 16:38  Ulrich Drepper  <drepper@cygnus.com>

	* restart.h (suspend): Clear p_signal before suspending.
	(suspend_with_cancellation): Likewise.
	Patch by Xavier Leroy <Xavier.Leroy@inria.fr>.

	* weaks.c: Make __pthread_key_create return 1.
	* sysdeps/pthread/libc-lock.h: Define __libc_key_create,
	__libc_getspecific, __libc_setspecific, and __libc_key_t.
	* sysdeps/pthread/stdio-lock.h: Don't care for implementation not
	using libio.

1997-03-19 15:13  Miguel de Icaza  <miguel@nuclecu.unam.mx>

	* sysdeps/sparc/pt-machine (RELEASE): Fix.

1997-03-01 07:55  Geoff Keating  <geoffk@ozemail.com.au>

	* sysdeps/powerpc/Implies: Added.
	* sysdeps/powerpc/pt-machine.h: Added.
	* sysdeps/powerpc/semaphorebits.h: Added.

1997-01-22 01:22  Ulrich Drepper  <drepper@cygnus.com>

	* linuxtheads/pthread.c (__pthread_initial_thread): Correct
	initializer.
	(__pthread_manager_thread): Likewise.
	Reported by Andreas Jaeger.

1997-01-18 22:15  Richard Henderson  <rth@tamu.edu>

	Since sigset_t no longer fits in a register, we can't pass in the
	thread's initial mask so easily.  Take this opportunity to simplify
	the clone implementation by only accepting a single void* argument.

	* linuxthreads/manager.c (__pthread_manager): Put thread vitals
	in the thread struct instead of as arguments through clone.
	(pthread_start_thread): Look for them there.
	* linuxthreads/internals.h (struct _pthread): Add p_initial_fn,
	p_initial_fn_arg, p_initial_mask.  Fix __pthread_manager proto.
	* linuxthreads/pthread.c (pthread_initialize_manager): Revise
	clone invocation.

1 files changed, 213 insertions, 0 deletions

diff --git a/linuxthreads/man/pthread_mutex_init.man b/linuxthreads/man/pthread_mutex_init.man
new file mode 100644
index 0000000000..bda4ec6c4d
--- /dev/null
+++ b/linuxthreads/man/pthread_mutex_init.man
@@ -0,0 +1,213 @@
+.TH PTHREAD_MUTEX 3 LinuxThreads
+
+.XREF pthread_mutex_lock
+.XREF pthread_mutex_unlock
+.XREF pthread_mutex_trylock
+.XREF pthread_mutex_destroy
+
+.SH NAME
+pthread_mutex_init, pthread_mutex_lock, pthread_mutex_trylock, pthread_mutex_unlock, pthread_mutex_destroy \- operations on mutexes
+
+.SH SYNOPSIS
+#include <pthread.h>
+
+pthread_mutex_t fastmutex = PTHREAD_MUTEX_INITIALIZER;
+
+pthread_mutex_t recmutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
+
+pthread_mutex_t errchkmutex = PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP;
+
+int pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *mutexattr);
+
+int pthread_mutex_lock(pthread_mutex_t *mutex));
+
+int pthread_mutex_trylock(pthread_mutex_t *mutex);
+
+int pthread_mutex_unlock(pthread_mutex_t *mutex);
+
+int pthread_mutex_destroy(pthread_mutex_t *mutex);
+
+.SH DESCRIPTION
+A mutex is a MUTual EXclusion device, and is useful for protecting
+shared data structures from concurrent modifications, and implementing
+critical sections and monitors.
+
+A mutex has two possible states: unlocked (not owned by any thread),
+and locked (owned by one thread). A mutex can never be owned by two
+different threads simultaneously. A thread attempting to lock a mutex
+that is already locked by another thread is suspended until the owning
+thread unlocks the mutex first.
+
+!pthread_mutex_init! initializes the mutex object pointed to by
+|mutex| according to the mutex attributes specified in |mutexattr|.
+If |mutexattr| is !NULL!, default attributes are used instead.
+
+The LinuxThreads implementation supports only one mutex attributes,
+the |mutex kind|, which is either ``fast'', ``recursive'', or
+``error checking''. The kind of a mutex determines whether
+it can be locked again by a thread that already owns it.
+The default kind is ``fast''. See !pthread_mutexattr_init!(3) for more
+information on mutex attributes.
+
+Variables of type !pthread_mutex_t! can also be initialized
+statically, using the constants !PTHREAD_MUTEX_INITIALIZER! (for fast
+mutexes), !PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP! (for recursive
+mutexes), and !PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP! (for error checking
+mutexes).
+
+!pthread_mutex_lock! locks the given mutex. If the mutex is currently
+unlocked, it becomes locked and owned by the calling thread, and
+!pthread_mutex_lock! returns immediately. If the mutex is already
+locked by another thread, !pthread_mutex_lock! suspends the calling
+thread until the mutex is unlocked.
+
+If the mutex is already locked by the calling thread, the behavior of
+!pthread_mutex_lock! depends on the kind of the mutex. If the mutex is
+of the ``fast'' kind, the calling thread is suspended until the mutex
+is unlocked, thus effectively causing the calling thread to
+deadlock. If the mutex is of the ``error checking'' kind,
+!pthread_mutex_lock! returns immediately with the error code !EDEADLK!.
+If the mutex is of the ``recursive'' kind, !pthread_mutex_lock!
+succeeds and returns immediately, recording the number of times the
+calling thread has locked the mutex. An equal number of
+!pthread_mutex_unlock! operations must be performed before the mutex
+returns to the unlocked state.
+
+!pthread_mutex_trylock! behaves identically to !pthread_mutex_lock!,
+except that it does not block the calling thread if the mutex is
+already locked by another thread (or by the calling thread in the case
+of a ``fast'' mutex). Instead, !pthread_mutex_trylock! returns
+immediately with the error code !EBUSY!.
+
+!pthread_mutex_unlock! unlocks the given mutex. The mutex is assumed
+to be locked and owned by the calling thread on entrance to
+!pthread_mutex_unlock!. If the mutex is of the ``fast'' kind,
+!pthread_mutex_unlock! always returns it to the unlocked state. If it
+is of the ``recursive'' kind, it decrements the locking count of the
+mutex (number of !pthread_mutex_lock! operations performed on it by
+the calling thread), and only when this count reaches zero is the
+mutex actually unlocked.
+
+On ``error checking'' mutexes, !pthread_mutex_unlock! actually checks
+at run-time that the mutex is locked on entrance, and that it was
+locked by the same thread that is now calling !pthread_mutex_unlock!.
+If these conditions are not met, an error code is returned and the
+mutex remains unchanged.  ``Fast'' and ``recursive'' mutexes perform
+no such checks, thus allowing a locked mutex to be unlocked by a
+thread other than its owner. This is non-portable behavior and must
+not be relied upon.
+
+!pthread_mutex_destroy! destroys a mutex object, freeing the resources
+it might hold. The mutex must be unlocked on entrance. In the
+LinuxThreads implementation, no resources are associated with mutex
+objects, thus !pthread_mutex_destroy! actually does nothing except
+checking that the mutex is unlocked.
+
+.SH CANCELLATION
+
+None of the mutex functions is a cancellation point, not even
+!pthread_mutex_lock!, in spite of the fact that it can suspend a
+thread for arbitrary durations. This way, the status of mutexes at
+cancellation points is predictable, allowing cancellation handlers to
+unlock precisely those mutexes that need to be unlocked before the
+thread stops executing. Consequently, threads using deferred
+cancellation should never hold a mutex for extended periods of time.
+
+.SH "ASYNC-SIGNAL SAFETY"
+
+The mutex functions are not async-signal safe. What this means is that
+they should not be called from a signal handler. In particular,
+calling !pthread_mutex_lock! or !pthread_mutex_unlock! from a signal
+handler may deadlock the calling thread.
+
+.SH "RETURN VALUE"
+
+!pthread_mutex_init! always returns 0. The other mutex functions
+return 0 on success and a non-zero error code on error.
+
+.SH ERRORS
+
+The !pthread_mutex_lock! function returns the following error code
+on error:
+.RS
+.TP
+!EINVAL!
+the mutex has not been properly initialized.
+
+.TP
+!EDEADLK!
+the mutex is already locked by the calling thread
+(``error checking'' mutexes only).
+.RE
+
+The !pthread_mutex_trylock! function returns the following error codes
+on error:
+.RS
+.TP
+!EBUSY!
+the mutex could not be acquired because it was currently locked.
+
+.TP
+!EINVAL!
+the mutex has not been properly initialized.
+.RE
+
+The !pthread_mutex_unlock! function returns the following error code
+on error:
+.RS
+.TP
+!EINVAL!
+the mutex has not been properly initialized.
+
+.TP
+!EPERM!
+the calling thread does not own the mutex (``error checking'' mutexes only).
+.RE
+
+The !pthread_mutex_destroy! function returns the following error code
+on error:
+.RS
+.TP
+!EBUSY!
+the mutex is currently locked.
+.RE
+
+.SH AUTHOR
+Xavier Leroy <Xavier.Leroy@inria.fr>
+
+.SH "SEE ALSO"
+!pthread_mutexattr_init!(3),
+!pthread_mutexattr_setkind_np!(3),
+!pthread_cancel!(3).
+
+.SH EXAMPLE
+
+A shared global variable |x| can be protected by a mutex as follows:
+
+.RS
+.ft 3
+.nf
+.sp
+int x;
+pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER;
+.ft
+.LP
+.RE
+.fi
+
+All accesses and modifications to |x| should be bracketed by calls to
+!pthread_mutex_lock! and !pthread_mutex_unlock! as follows:
+
+.RS
+.ft 3
+.nf
+.sp
+pthread_mutex_lock(&mut);
+/* operate on x */
+pthread_mutex_unlock(&mut);
+.ft
+.LP
+.RE
+.fi
+
+