Multithreaded Programming Guide

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Updated: July 2014
 
 

Using Mutual Exclusion Locks

Table 4–3 lists the functions that manipulate mutex locks.

Table 4-3  Routines for Mutual Exclusion Locks
Operation
Related Function Description
Initialize a mutex
pthread_mutex_init Syntax
Make mutex consistent
pthread_mutex_consistent_np Syntax
Lock a mutex
pthread_mutex_lock Syntax
Unlock a mutex
pthread_mutex_unlock Syntax
Lock with a nonblocking mutex
pthread_mutex_trylock Syntax
Lock a mutex before a specified time
pthread_mutex_timedlock() Syntax
Lock a mutex within a specified time interval
pthread_mutex_reltimedlock_np() Syntax
Destroy a mutex
pthread_mutex_destroy Syntax

The default scheduling policy, SCHED_OTHER, does not specify the order in which threads can acquire a lock. When multiple SCHED_OTHER threads are waiting for a mutex, the order of acquisition is undefined. Under the SCHED_FIFO and SCHED_RR real-time scheduling policies, the behavior is to unblock waiting threads in priority order.

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