packages/compat/linux/v2_0/include/linux/rwsem.h

   1 #ifndef __LINUX_RWSEM_H__
   2 #define __LINUX_RWSEM_H__
   3
   4 // eCos does not have the concept of a read/write semaphore. So just
   5 // map them onto normal semaphores and hope we don't deadlock
   6 // somewhere.
   7
   8 #include <asm/semaphore.h>
   9
  10 struct rw_semaphore;
  11
  12 #define down_read(sem) cyg_drv_mutex_lock((cyg_drv_mutex_t *)sem)
  13 #define down_read_trylock(sem) cyg_drv_mutex_trylock((cyg_drv_mutex_t *)sem)
  14 #define down_write(sem) cyg_drv_mutex_lock((cyg_drv_mutex_t *)sem)
  15 #define down_write_trylock(sem) cyg_drv_mutex_trylock((cyg_drv_mutex_t *)sem)
  16 #define up_read(sem) cyg_drv_mutex_unlock((cyg_drv_mutex_t *)sem)
  17 #define up_write(sem) cyg_drv_mutex_unlock((cyg_drv_mutex_t *)sem)
  18 #define downgrade_write(sem)
  19
  20 #endif // __LINUX_RWSEM_H__