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THR_SUSPEND(2) FreeBSD System Calls Manual THR_SUSPEND(2) NAME thr_suspend - suspend the calling thread LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <sys/thr.h> int thr_suspend(struct timespec *timeout); DESCRIPTION This function is intended for implementing threading. Normal applications should use pthread_cond_timedwait(3) together with pthread_cond_broadcast(3) for typical safe suspension 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 suspended 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. RETURN VALUES 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. ERRORS 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. SEE ALSO ps(1), thr_wake(2), pthread_resume_np(3), pthread_suspend_np(3) STANDARDS The thr_suspend() system call is non-standard. HISTORY The thr_suspend() system call first appeared in FreeBSD 5.2. FreeBSD 14.1-RELEASE-p8 May 5, 2020 FreeBSD 14.1-RELEASE-p8