Is there an alternative sleep function in C to milliseconds

Question

I have some source code that was compiled on Windows  I am converting it to run on Red Hat Linux    The source code has included the  lt windows h gt  header file and the programmer has used the Sleep   function to wait for a period of milliseconds  This won t work on the Linux   However  I can use the sleep seconds  function  but that uses integer in seconds  I don t want to convert milliseconds to seconds  Is there a alternative sleep function that I can use with gcc compiling on Linux

User · Answer

include  lt unistd h gt   int usleep useconds t useconds     pass in microseconds

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You can use this cross-platform function   ifdef WIN32  include  lt windows h gt   elif  POSIX C SOURCE  gt   199309L  include  lt time h gt       for nanosleep  else  include  lt unistd h gt     for usleep  endif  void sleep ms int milliseconds      cross-platform sleep function  ifdef WIN32     Sleep milliseconds    elif  POSIX C SOURCE  gt   199309L     struct timespec ts      ts tv sec   milliseconds   1000      ts tv nsec    milliseconds   1000    1000000      nanosleep  amp ts  NULL    else     if  milliseconds  gt   1000        sleep milliseconds   1000       usleep  milliseconds   1000    1000    endif

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include  lt stdio h gt   include  lt stdlib h gt  int main       puts  Program Will Sleep For 2 Seconds     system  sleep 2            works for linux systems   return 0

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Beyond usleep  the humble select with NULL file descriptor sets will let you pause with microsecond precision  and without the risk of SIGALRM complications   sigtimedwait and sigwaitinfo offer similar behavior

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Alternatively to usleep    which is not defined in POSIX 2008  though it was defined up to POSIX 2004  and it is evidently available on Linux and other platforms with a history of POSIX compliance   the POSIX 2008 standard defines nanosleep     nanosleep - high resolution sleep  include  lt time h gt  int nanosleep const struct timespec  rqtp  struct timespec  rmtp    The nanosleep   function shall cause the current thread to be suspended from execution until either the time interval specified by the rqtp argument has elapsed or a signal is delivered to the calling thread  and its action is to invoke a signal-catching function or to terminate the process  The suspension time may be longer than requested because the argument value is rounded up to an integer multiple of the sleep resolution or because of the scheduling of other activity by the system  But  except for the case of being interrupted by a signal  the suspension time shall not be less than the time specified by rqtp  as measured by the system clock CLOCK REALTIME  The use of the nanosleep   function has no effect on the action or blockage of any signal

User · Answer

Yes - older POSIX standards defined usleep    so this is available on Linux   int usleep useconds t usec    DESCRIPTION The  usleep    function  suspends execution of the calling thread for  at least  usec microseconds   The sleep may be lengthened slightly by any system activity or by the time spent processing the call or by the granularity of system timers   usleep   takes microseconds  so you will have to multiply the input by 1000 in order to sleep in milliseconds   usleep   has since been deprecated and subsequently removed from POSIX  for new code  nanosleep   is preferred    include  lt time h gt   int nanosleep const struct timespec  req  struct timespec  rem    DESCRIPTION nanosleep   suspends the execution of the calling thread until either at least the time specified in  req has elapsed  or the delivery of a signal that triggers the invocation of a handler in the calling thread or that terminates the process  The structure timespec is used to specify intervals of time with nanosecond precision   It is defined as follows  struct timespec       time t tv sec            seconds        long   tv nsec           nanoseconds         An example msleep   function implemented using nanosleep    continuing the sleep if it is interrupted by a signal   include  lt time h gt   include  lt errno h gt          msleep    Sleep for the requested number of milliseconds     int msleep long msec        struct timespec ts      int res       if  msec  lt  0                errno   EINVAL          return -1             ts tv sec   msec   1000      ts tv nsec    msec   1000    1000000       do           res   nanosleep  amp ts   amp ts         while  res  amp  amp  errno    EINTR        return res

[c] Is there an alternative sleep function in C to milliseconds?

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