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30 lines
608 B
C
30 lines
608 B
C
#include "pthread_impl.h"
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#include "syscall.h"
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static pthread_once_t check_pi_once;
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static int check_pi_result;
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static void check_pi()
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{
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volatile int lk = 0;
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check_pi_result = -__syscall(SYS_futex, &lk, FUTEX_LOCK_PI, 0, 0);
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}
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int pthread_mutexattr_setprotocol(pthread_mutexattr_t *a, int protocol)
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{
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switch (protocol) {
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case PTHREAD_PRIO_NONE:
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a->__attr &= ~8;
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return 0;
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case PTHREAD_PRIO_INHERIT:
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pthread_once(&check_pi_once, check_pi);
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if (check_pi_result) return check_pi_result;
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a->__attr |= 8;
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return 0;
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case PTHREAD_PRIO_PROTECT:
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return ENOTSUP;
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default:
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return EINVAL;
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}
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}
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