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电梯直达

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发表于 2004-03-01 10:18 |只看该作者 |倒序浏览

以前为了让某个线程单独延时都是用的usleep/nanusleep,有人说这会让整个进程都sleep，是真的吗？man里也没说明，还有pthread_delay_np  好象linux也不支持吧

NAME
   getitimer, setitimer ? get or set value of an interval timer

SYNOPSIS
   #include <sys/time.h>;

   int getitimer(int which, struct itimerval *value);
   int  setitimer(int which, const struct itimerval *value, struct itimer?\
            val *ovalue);

DESCRIPTION
   The system provides each  process  with  three  interval  timers,  each
   decrementing in a distinct time domain.  When any timer expires, a sig?\
   nal is sent to the process, and the timer (potentially) restarts.

**************************************************************

NAME
   usleep ? suspend execution for microsecond intervals

SYNOPSIS
   #include <unistd.h>;

   void usleep(unsigned long usec);
   int usleep(unsigned long usec); /* SUSv2 */

DESCRIPTION
   The  usleep()  function  suspends  execution of the calling process for
   usec microseconds.  The sleep may be lengthened slightly by any  system
   activity or by the time spent processing the call.

**************************************************************

NAME
   nanosleep ? pause execution for a specified time

SYNOPSIS
   #include <time.h>;

   int nanosleep(const struct timespec *req, struct timespec *rem);

DESCRIPTION
   nanosleep  delays  the  execution  of the program for at least the time
   specified in *req.  The function can return earlier  if  a  signal  has
   been  delivered to the process. In this case, it returns ?1, sets errno
   to EINTR, and writes the remaining time into the structure  pointed  to
   by  rem unless rem is NULL.  The value of *rem can then be used to call
   nanosleep again and complete the specified pause.