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FreeBSD 11.0 - man page for sched_yield (freebsd section 2)

SCHED_YIELD(2)						      BSD System Calls Manual						    SCHED_YIELD(2)

NAME
sched_yield -- yield processor
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sched.h> int sched_yield(void);
DESCRIPTION
The sched_yield() system call forces the running process to relinquish the processor until it again becomes the head of its process list. It takes no arguments.
RETURN VALUES
The sched_yield() 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
On failure errno will be set to the corresponding value: [ENOSYS] The system is not configured to support this functionality.
STANDARDS
The sched_yield() system call conforms to IEEE Std 1003.1b-1993 (``POSIX.1'').
BSD
March 12, 1998 BSD

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