diff options
Diffstat (limited to 'mdk-stage1/dietlibc/libpthread/pthread_mutex_trylock.c')
-rw-r--r-- | mdk-stage1/dietlibc/libpthread/pthread_mutex_trylock.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/mdk-stage1/dietlibc/libpthread/pthread_mutex_trylock.c b/mdk-stage1/dietlibc/libpthread/pthread_mutex_trylock.c new file mode 100644 index 000000000..fcf63f75e --- /dev/null +++ b/mdk-stage1/dietlibc/libpthread/pthread_mutex_trylock.c @@ -0,0 +1,36 @@ +#include <unistd.h> +#include <sched.h> +#include <errno.h> + +#include <pthread.h> +#include "thread_internal.h" + +/* will never return EINVAL ! */ + +int pthread_mutex_trylock(pthread_mutex_t *mutex) +{ + _pthread_descr this; + + __THREAD_INIT(); + + this = __thread_self(); + + if (this!=mutex->owner) { + /* wait for mutex to free */ + if (__pthread_trylock(&(mutex->lock))) { + (*(__errno_location()))=EBUSY; + return -1; + } + + mutex->owner=this; + } + else if (mutex->kind==PTHREAD_MUTEX_ERRORCHECK_NP) + { + (*(__errno_location()))=EDEADLK; + return -1; + } + + if (mutex->kind==PTHREAD_MUTEX_RECURSIVE_NP) ++(mutex->count); + + return 0; +} |