minix/include/ddekit/semaphore.h

   1 #ifndef _DDEKIT_SEMAPHORE_H
   2 #define _DDEKIT_SEMAPHORE_H
   3
   4 #include <ddekit/ddekit.h>
   5
   6
   7 /** \defgroup DDEKit_synchronization */
   8
   9 struct ddekit_sem;
  10 typedef struct ddekit_sem ddekit_sem_t;
  11
  12 /** Initialize DDEKit semaphore.
  13  *
  14  * \ingroup DDEKit_synchronization
  15  *
  16  * \param value  initial semaphore counter
  17  */
  18 ddekit_sem_t *ddekit_sem_init(int value);
  19
  20 /** Uninitialize semaphore.
  21  *
  22  * \ingroup DDEKit_synchronization
  23  */
  24 void ddekit_sem_deinit(ddekit_sem_t *sem);
  25
  26 /** Semaphore down method. */
  27 void ddekit_sem_down(ddekit_sem_t *sem);
  28
  29 /** Semaphore down method, non-blocking.
  30  *
  31  * \ingroup DDEKit_synchronization
  32  *
  33  * \return 0   success
  34  * \return !=0 would block
  35  */
  36 int ddekit_sem_down_try(ddekit_sem_t *sem);
  37
  38 /** Semaphore down with timeout.
  39  *
  40  * \ingroup DDEKit_synchronization
  41  *
  42  * \return 0   success
  43  * \return !=0 would block
  44  */
  45 int ddekit_sem_down_timed(ddekit_sem_t *sem, int timo);
  46
  47 /** Semaphore up method.
  48  *
  49  * \ingroup DDEKit_synchronization
  50  */
  51 void ddekit_sem_up(ddekit_sem_t *sem);
  52
  53 #endif