Set scheduling priority of a thread
#include <pthread.h> int pthread_setschedprio(pthread_t thread, int prio); Compile and link with -pthread.
The pthread_setschedprio() function sets the scheduling priority of the thread thread to the value specified in prio. (By contrast pthread_setschedparam(3) changes both the scheduling policy and priority of a thread.)
On success, this function returns 0; on error, it returns a nonzero error number. If pthread_setschedprio() fails, the scheduling priority of thread is not changed.
prio is not valid for the scheduling policy of the specified thread.
The caller does not have appropriate privileges to set the specified priority.
No thread with the ID thread could be found.
POSIX.1-2001 also documents an ENOTSUP ("attempt was made to set the priority to an unsupported value") error for pthread_setschedparam(3).
This function is available in glibc since version 2.3.4.
The pthread_setschedprio() function is thread-safe.
For a description of the permissions required to, and the effect of, changing a thread's scheduling priority, and details of the permitted ranges for priorities in each scheduling policy, see sched(7).
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