THR_WAKE(2FREEBSD) - Linux man page online | System calls
Wake up the suspended thread.
September 23, 2016
THR_WAKE(2) BSD System Calls Manual THR_WAKE(2)
BSD September 23, 2016 BSD
NAMEthr_wake — wake up the suspended thread
LIBRARYStandard C Library (libc, -lc)
SYNOPSIS#include <sys/thr.h> int thr_wake(long id);
DESCRIPTIONThis 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. Passing the thread identifier of the calling thread (see thr_self(2)) to thr_wake() sets a thread's flag to cause the next signal-interruptible sleep of that thread in the kernel to fail immediately with the EINTR error. The flag is cleared by an interruptible sleep attempt or by a call to thr_suspend(2.) This is used by the system threading library to implement cancellation. If id is not equal to the current thread identifier, the specified thread is woken up if suspended by the thr_suspend system call. If the thread is not suspended at the time of the thr_wake call, the wake is remembered and the next attempt of the thread to suspend itself with the thr_suspend(2) results in immediate return with success. Only one wake is remem‐ bered.
RETURN VALUESThe thr_wake() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.
ERRORSThe thr_wake() operation returns these errors: [ESRCH] The specified thread was not found or does not belong to the process of the calling thread.
SEE ALSOps(1), thr_self(2) thr_suspend(2), pthread_cancel(3), pthread_resume_np(3), pthread_suspend_np(3)
STANDARDSThe thr_suspend() system call is non-standard and is used by 1:1 Threading Library (libthr, -lthr) to implement IEEE Std 1003.1-2001 (“POSIX.1”) pthread(3) functionality.
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|refer to||ps(1) | pthread_cancel(3) | pthread_cond_init(3) | thr_self(2freebsd) | thr_suspend(2freebsd)|