THR_SUSPEND(2FREEBSD) - Linux man page online | System calls

Suspend the calling thread.

September 23, 2016
THR_SUSPEND(2) BSD System Calls Manual THR_SUSPEND(2)


thr_suspend — suspend the calling thread


Standard C Library (libc, -lc)


#include <sys/thr.h> int thr_suspend(struct timespec *timeout);


This function is intended for implementing threading. Normal applications should use pthread_cond_timedwait(3) together with pthread_cond_broadcast(3) for typical safe suspen‐ sion with cooperation of the thread being suspended, or pthread_suspend_np(3) and pthread_resume_np(3) in some specific situations, instead. The thr_suspend() system call puts the calling thread in a suspended state, where it is not eligible for CPU time. This state is exited by another thread calling thr_wake(2), when the time interval specified by timeout has elapsed, or by the delivery of a signal to the sus‐ pended thread. If the timeout argument is NULL, the suspended state can be only terminated by explicit thr_wake() or signal. If a wake from thr_wake(2) was delivered before the thr_suspend call, the thread is not put into a suspended state. Instead, the call returns immediately without an error. If a thread previously called thr_wake(2) with its own thread identifier, which resulted in setting the internal kernel flag to immediately abort interruptible sleeps with an EINTR error (see thr_wake(2)), the flag is cleared. As with thr_wake(2) called from another thread, the next thr_suspend call does not result in suspension.


The thr_suspend() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.


The thr_suspend() operation returns the following errors: [EFAULT] The memory pointed to by the timeout argument is not valid. [ETIMEDOUT] The specified timeout expired. [ETIMEDOUT] The timeout argument specified a zero time interval. [EINTR] The sleep was interrupted by a signal.


ps(1), thr_wake(2), pthread_resume_np(3), pthread_suspend_np(3)


The thr_suspend() system call is non-standard.
BSD September 23, 2016 BSD
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thr_suspend(2freebsd) referred by thr_wake(2freebsd)
refer to ps(1) | pthread_cond_init(3) | thr_wake(2freebsd)
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