diff options
Diffstat (limited to 'src/thread/pthread_mutexattr_setprotocol.c')
-rw-r--r-- | src/thread/pthread_mutexattr_setprotocol.c | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/src/thread/pthread_mutexattr_setprotocol.c b/src/thread/pthread_mutexattr_setprotocol.c index c92a31c8..511cc32d 100644 --- a/src/thread/pthread_mutexattr_setprotocol.c +++ b/src/thread/pthread_mutexattr_setprotocol.c @@ -1,7 +1,29 @@ #include "pthread_impl.h" +#include "syscall.h" + +static pthread_once_t check_pi_once; +static int check_pi_result; + +static void check_pi() +{ + volatile int lk = 0; + check_pi_result = -__syscall(SYS_futex, &lk, FUTEX_LOCK_PI, 0, 0); +} int pthread_mutexattr_setprotocol(pthread_mutexattr_t *a, int protocol) { - if (protocol) return ENOTSUP; - return 0; + switch (protocol) { + case PTHREAD_PRIO_NONE: + a->__attr &= ~8; + return 0; + case PTHREAD_PRIO_INHERIT: + pthread_once(&check_pi_once, check_pi); + if (check_pi_result) return check_pi_result; + a->__attr |= 8; + return 0; + case PTHREAD_PRIO_PROTECT: + return ENOTSUP; + default: + return EINVAL; + } } |