отдать процессор (yield the processor)
Имя (Name)
sched_yield - yield the processor
Синопсис (Synopsis)
#include <sched.h>
int sched_yield(void);
Описание (Description)
sched_yield() causes the calling thread to relinquish the CPU.
The thread is moved to the end of the queue for its static
priority and a new thread gets to run.
Возвращаемое значение (Return value)
On success, sched_yield() returns 0. On error, -1 is returned,
and errno is set to indicate the error.
Ошибки (Error)
In the Linux implementation, sched_yield() always succeeds.
Стандарты (Conforming to)
POSIX.1-2001, POSIX.1-2008.
Примечание (Note)
If the calling thread is the only thread in the highest priority
list at that time, it will continue to run after a call to
sched_yield().
POSIX systems on which sched_yield() is available define
_POSIX_PRIORITY_SCHEDULING in <unistd.h>.
Strategic calls to sched_yield() can improve performance by
giving other threads or processes a chance to run when (heavily)
contended resources (e.g., mutexes) have been released by the
caller. Avoid calling sched_yield() unnecessarily or
inappropriately (e.g., when resources needed by other schedulable
threads are still held by the caller), since doing so will result
in unnecessary context switches, which will degrade system
performance.
sched_yield() is intended for use with real-time scheduling
policies (i.e., SCHED_FIFO or SCHED_RR). Use of sched_yield()
with nondeterministic scheduling policies such as SCHED_OTHER is
unspecified and very likely means your application design is
broken.
Смотри также (See also)
sched(7)
