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Unexpected Error From C Library During Pthread Cond Timedwait

Sure I use a few threads, but those are initialized in the very beginning and run as infinite loops, nothing fancy. Function has a single argument: pointer to void. *arg - pointer to argument of function. Bug fixes --------- * Bug and memory leak in sem_init() - Alex Blanco * ptw32_getprocessors() now returns CPU count of 1 for WinCE. - James Ewing check over here

Following a similar model to mutexes above, these have been rewritten to use preliminary users space checks. * sem_getvalue() now returns the number of waiters. * The POSIX thread ID now Why does removing Iceweasel nuke GNOME? Note that in the usual case there is no context switch. Another possibility is that thread two would first increment counter locking out thread one until complete and then thread one would increment it to 2. Sequence Thread 1 Thread 2 https://github.com/frida/glib/blob/master/glib/gthread-posix.c

Threads in the same process share: Process instructions Most data open files (descriptors) signals and signal handlers current working directory User and group id Each thread has a unique: Thread ID Fortran programmers can use wrappers around C function calls. The effect is as if the thread were unblocked, allowed to execute up to the point of returning from the call to pthread_cond_timedwait() or pthread_cond_wait(), but at that point notices the Done.\n", NUM_THREADS); /* Clean up and exit */ pthread_attr_destroy(&attr); pthread_mutex_destroy(&count_mutex); pthread_cond_destroy(&count_threshold_cv); pthread_exit(NULL); } Monitoring, Debugging and Performance Analysis Tools for Pthreads Monitoring and Debugging Pthreads: Debuggers vary in their ability

  • For UNIX systems, this interface has been specified by the IEEE POSIX 1003.1c standard (1995).
  • Hadjidoukas's QueueUserAPCEx package be installed.
  • Be sure to run your builds against the test suite.
  • Trick or Treat polyglot Does the reciprocal of a probability represent anything?
  • The logic conditions (the "if" and "while" statements) must be chosen to insure that the "signal" is executed if the "wait" is ever processed.

Prentice Hall Appendix A: Pthread Library Routines Reference For convenience, an alphabetical list of Pthread routines, linked to their corresponding man page, is provided below. Stack unwinding will now NOT occur when a thread is canceled, or the thread calls pthread_exit(). Example codes are used throughout to demonstrate how to use most of the Pthreads routines needed by a new Pthreads programmer. This is done in order to ensure that the cancellation cleanup handler is executed in the same state as the critical code that lies both before and after the call to

RELEASE 2.7.0 ------------- (2005-06-04) General ------- All new features in this release have been back-ported in release 1.11.0, including the incorporation of MCS locks in pthread_once, however, versions 1 and 2 If a signal is delivered to a thread waiting for a condition variable, upon return from the signal handler the thread resumes waiting for the condition variable as if it was End of informative text. https://lists.freedesktop.org/archives/gstreamer-devel/2014-September/049711.html If mutex is a robust mutex where an owner terminated while holding the lock and the state is recoverable, the mutex shall be acquired even though the function returns an error

Root Window showing all threads Threads Pane: Shows threads associated with the selected process See the TotalView Debugger tutorial for details. Also tests that pthread_setspecific() and pthread_getspecific() are callable from destructors. All threads within a process share the same address space. Thread 1 has exclusive use of variable counter counter = 2 If register load and store operations for the incrementing of variable counter occurs with unfortunate timing, it is theoretically possible

Also following the pthread code I can't find this error. That is, once a thread begins it's cancellation run, cancellation is disabled and a subsequent cancel request will return an error (ESRCH). * errno: An incorrect compiler directive caused a local mypredicate(&t) && rc == 0) rc = pthread_cond_timedwait(&t.cond, &t.mn, &ts); t.waiters--; if (rc == 0 || mypredicate(&t)) setmystate(&t); (void) pthread_mutex_unlock(&t.mn); By making the timeout parameter absolute, it does not need to Berg.

That is, the functions pthread_cond_wait() or pthread_cond_timedwait() are points where a pending (or concurrent) cancellation request is noticed. http://centralpedia.com/unexpected-error/unexpected-error-while-trying-to-load-the-microsoft-framework-library.html Since there needs to be at least one context switch per Ada rendezvous, the efficiency of waiting on a condition variable is important. Schmidt, Stephen D. For that reason, waiting on a condition variable should * always be in a loop, based on an explicitly-checked predicate. * * %TRUE is returned if the condition variable was signalled

Otherwise it * returns %FALSE. * * Returns: %TRUE if @rw_lock could be locked * * Since: 2.32 */ gboolean g_rw_lock_reader_trylock (GRWLock *rw_lock) { if (pthread_rwlock_tryrdlock (g_rw_lock_get_impl (rw_lock)) != 0) return Because no commercial Unix POSIX threads implementation allows you to choose to have stack unwinding. Any thread can be canceled by any other thread (Win32 or POSIX) if the former thread's POSIX pthread_t value is known. http://centralpedia.com/unexpected-error/unexpected-error-microsoft-framework-library-mac.html A Win32 thread can discover it's own POSIX thread ID by calling pthread_self(), which will create the handle if necessary and return the pthread_t value.

Nichols et al. and Ross Johnson pthread_key_delete() bug introduced in release 2.9.x caused this routine to fail in a way that the test suite was not detecting. Thread Scheduling: When this option is enabled, each thread may have its own scheduling properties.

Not sure if this is general or just when building 32 bit libraries and apps that run on 64 bit systems.

New tests --------- * stress1.c - attempts to expose problems in condition variable and semaphore timed wait logic. Note that in the usual case there is no context switch. New Features ------------ New routines: pthread_timedjoin_np() pthread_tryjoin_np() - added for compatibility with Linux. pthread_once (once_control, init_routine) pthread_once executes the init_routine exactly once in a process.

The set can also be read online at: http://sources.redhat.com/pthreads-win32/manual/index.html Thanks again to Tim Theisen for running the test suite pre-release on an MP system. A new test has been added to confirm that this routine behaves correctly, particularly when keys with destructors are deleted before threads exit. - Stephane Clairet pthread_win32_process_attach_np() fix potential failure/security around sched_getaffinity() sched_setaffinity() pthread_getaffinity_np() pthread_setaffinity_np() pthread_attr_getaffinity_np() pthread_attr_setaffinity_np() - added for compatibility with Linux and other libgcc-based systems. have a peek at these guys Bug Fixes --------- Small object file static linking now works.

IEEEStd1003.1-2001/Cor2-2004, item XSH/TC2/D6/89 is applied, updating the DESCRIPTION for consistency with the pthread_cond_destroy() function that states it is safe to destroy an initialized condition variable upon which no threads are currently Fixed bugs in condition variables - (Peter Slacik): - additional contention checks - properly adjust number of waiting threads after timed condvar timeout. An alternate implementation of POSIX semaphores is built using W32 events for these systems when NEED_SEM is defined. Routine Prefix Functional Group pthread_ Threads themselves and miscellaneous subroutines pthread_attr_ Thread attributes objects pthread_mutex_ Mutexes pthread_mutexattr_ Mutex attributes objects.

Waiting on a condition variable should be a relatively rare situation. See the Pthread Library Routines Reference section for more information. As such, calling g_mutex_lock() on a #GMutex that has * already been locked by the same thread results in undefined behaviour * (including but not limited to deadlocks). */ void g_mutex_lock It can be as efficient as simply passing a pointer.

Using Condition Variables Example 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 This routine no longer returns ENOTSUP when NEED_SEM is defined - it is supported (NEED_SEM is only required for WinCE versions prior to 3.0). * Fix timeout bug in sem_timedwait(). - deadlock) problem if a waiting thread has a higher priority than the initting thread. Any mutex can be used, there is no explicit link between the mutex and the condition variable.

The Open Group Corrigendum U021/9 is applied, correcting the prototype for the pthread_cond_wait() function. New features ------------ * Added for compatibility: PTHREAD_RECURSIVE_MUTEX_INITIALIZER, PTHREAD_ERRORCHECK_MUTEX_INITIALIZER, PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP, PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP * Initial support for Digital Mars compiler - Anuj Goyal * Faster Mutexes. If @mutex is already locked by another thread, the * current thread will block until @mutex is unlocked by the other * thread. * * #GMutex is neither guaranteed to be It should be called after mutex is locked, and must unlock mutex in order for pthread_cond_wait() routine to complete.

The behavior is undefined if the value specified by the cond or mutex argument to these functions does not refer to an initialized condition variable or an initialized mutex object, respectively. statically linked applications need not call the routines pthread_win32_process_attach_np() and pthread_win32_process_detach_np() explicitly. The old source files are reused to congregate the individual routine files into larger translation units (via a bunch of # includes) so that the compiler can still optimise wherever possible, By making condition wait a cancellation point, the thread can be canceled and perform its cancellation cleanup handler even though it may be stuck in some indefinite wait.

Timed Wait Semantics An absolute time measure was chosen for specifying the timeout parameter for two reasons. Be careful when applying two or more mutexes to a section of code. The macros to manipulate cpu_set_t objects (the cpu affinity mask vector) are also defined: CPU_ZERO, CPU_CLR, CPU_SET, CPU_EQUAL, CPU_AND, CPU_OR, CPU_XOR, CPU_COUNT, CPU_ISSET.