lock-impl.c

kaffe是一个java虚拟机的源代码。里面包含了一些java例程和标准的java包。

/*
 * lock-impl.c - pthread-based LockInterface implementation (Posix style)
 *
 * Copyright (c) 1998
 *      Transvirtual Technologies, Inc.  All rights reserved.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file.
 */

#include <pthread.h>

#include "config.h"
#include "config-std.h"
#include "gtypes.h"

#include "thread.h"
#include "lock-impl.h"

/*
 * Wait on the condvar with a given relative timeout in ms (which we
 * have to convert into a absolute timespec now)
 */
jboolean
jcondvar_wait ( jcondvar* cv, jmutex *mux, jlong timeout )
{
  nativeThread    *cur = GET_CURRENT_THREAD(&cur);
  int             stat;
  struct timespec abst;
  struct timeval  now;

  //CHECK_LOCK( cur,lk);

  cur->stackCur  = (void*)&cur;

  if ( timeout == 0 ) {
	/* we handle this as "wait forever"	*/
	cur->blockState |= BS_CV;
	stat = pthread_cond_wait( cv, mux );
	cur->blockState &= ~BS_CV;
  }
  else {
	/* timeout is in millisecs, timeval in microsecs, and timespec in nanosecs */
	gettimeofday( &now, 0);
	abst.tv_sec = now.tv_sec + (timeout / 1000);
	abst.tv_nsec = (now.tv_usec * 1000) + (timeout % 1000) * 1000000;
 
	cur->blockState |= BS_CV_TO;
	stat = pthread_cond_timedwait( cv, mux, &abst);
	cur->blockState &= ~BS_CV_TO;
  }
  
  return (stat == 0);
}