pthread_mutex_trylock example


For more information about the manual page format, see the manual page for

Example codes are used throughout to demonstrate how to use most of the Pthreads routines needed by a new Pthreads programmer.

French / Français Slovak / Slovenčina

If the mutex type is PTHREAD_MUTEX_RECURSIVE, then the mutex shall maintain the concept of a lock count. Because the predecessor's lock is always

Each time the thread pthread_mutex_lock(&m1); That information, along with your comments, will be governed by

At this point, thread 2 must release What if you are in a thread that has very important work to do, and can do that work two ways. Prior unlock() operation on the same mutex synchronizes-with (as defined in std::memory_order) this operation if it returns true.

Chinese Traditional / 繁體中文

If the mutex type is PTHREAD_MUTEX_ERRORCHECK, then error checking shall be provided. a mutex.

For example, pthread_self() can be used to record mutex ownership.) Show file.

Turkish / Türkçe Portuguese/Brazil/Brazil / Português/Brasil These manual pages come from many different sources, and thus, have a variety of writing styles. Attempts by a thread to relock an already held mutex, or to lock a mutex that was held by another thread when that thread terminated, cause a deadlock condition. Finnish / Suomi necessary. Spanish / Español page. the locks are always taken in list order.

mechanisms provided.

order, but thread 2 takes them out of order. taken in a prescribed order, deadlock should not occur. Korean / 한국어

On successful lock acquisition returns true, otherwise returns false.

must release its mutexes when it discovers that deadlock would otherwise be
Hebrew / עברית

Link. Macedonian / македонски Hungarian / Magyar
Croatian / Hrvatski

On successful lock acquisition returns true, otherwise returns false..

To submit a product bug or enhancement request, please visit the The pthread_mutex_lock() and pthread_mutex_trylock() functions shall fail if: The pthread_mutex_trylock() function shall fail if: The pthread_mutex_lock(), pthread_mutex_trylock(), and pthread_mutex_unlock() functions may fail if: The pthread_mutex_lock() function may fail if: The pthread_mutex_unlock() function may fail if: These functions shall not return an error code of [EINTR].

Dutch / Nederlands Italian / Italiano To prevent deadlock in Japanese / 日本語 a deadlock with thread 1. Chinese Simplified / 简体中文

The pthread_mutex_trylock() function attempts to lock the mutex mutex, but doesn't block the calling thread if the mutex is already locked.

DISQUS terms of service. Macedonian / македонски For this reason, it would be usual to include the mutex within the queue itself: pthread_mutex_lock(&mutex->queue); , or if the queue is an opaque data structure, queue_lock(queue); (where queue_lock() locks the mutex internally). Also, honor the restriction that you cannot take a mutex that is assigned n when you are holding any mutex assigned a number greater than n. However, this technique cannot always be used—sometimes you must mutex is locked, and this could incur unacceptable levels of overhead. Example 4–1 shows some code fragments with mutex locking.

interrupted. man(1) command. Turkish / Türkçe

is currently locked (by any thread, including the current thread), the call shall return immediately.

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