blocks.nc

用于传感器网络的节点操作系统 TinyOS 结构设计非常有意思

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/*
 * Authors:   Philip Levis
 * History:   July 21, 2002
 *	     
 *
 */

includes Bombilla;

module BLocks {
  provides interface BombillaLocks as Locks;
  uses interface BombillaError;
}


implementation {
  command result_t Locks.lock(BombillaContext* context,
			      BombillaLock* locks,
			      uint8_t lockNum) {
    locks[lockNum].holder = context;
    context->heldSet |= (1 << lockNum);
    dbg(DBG_USR2, "VM: Context %i locking lock %i\n", (int)context->which, (int)lockNum);
    return SUCCESS;
  }

  command result_t Locks.unlock(BombillaContext* context,
				BombillaLock* locks, 
				uint8_t lockNum) {
    context->heldSet &= ~(1 << lockNum);
    locks[lockNum].holder = 0;
    dbg(DBG_USR2, "VM: Context %i unlocking lock %i\n", (int)context->which, (int)lockNum);
  }


  command boolean Locks.isLocked(BombillaLock* locks, uint8_t lockNum) {
    return (locks[lockNum].holder != 0);
  }

  command boolean Locks.isHeldBy(BombillaLock* locks, 
				 uint8_t lockNum,
				 BombillaContext* context) {
    return (locks[lockNum].holder == context);
  }


}