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author | rjohnson <rjohnson@noemail.net> | 1998-03-26 14:56:54 (GMT) |
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committer | rjohnson <rjohnson@noemail.net> | 1998-03-26 14:56:54 (GMT) |
commit | f3d590299d8632bc7d324901d27250ed07a6f074 (patch) | |
tree | c168cc164a71f320db9dcdfe7518ba7bd0d2c8d9 /unix/tclUnixEvent.c | |
parent | 26a76b6c669bbb7629454ffa56a7f3f501a86dae (diff) | |
download | tcl-f3d590299d8632bc7d324901d27250ed07a6f074.zip tcl-f3d590299d8632bc7d324901d27250ed07a6f074.tar.gz tcl-f3d590299d8632bc7d324901d27250ed07a6f074.tar.bz2 |
Initial revision
FossilOrigin-Name: f86c34e38d2a946e0ed196001fd756c57f90791a
Diffstat (limited to 'unix/tclUnixEvent.c')
-rw-r--r-- | unix/tclUnixEvent.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/unix/tclUnixEvent.c b/unix/tclUnixEvent.c new file mode 100644 index 0000000..24841ca --- /dev/null +++ b/unix/tclUnixEvent.c @@ -0,0 +1,76 @@ +/* + * tclUnixEvent.c -- + * + * This file implements Unix specific event related routines. + * + * Copyright (c) 1997 by Sun Microsystems, Inc. + * + * See the file "license.terms" for information on usage and redistribution + * of this file, and for a DISCLAIMER OF ALL WARRANTIES. + * + * SCCS: @(#) tclUnixEvent.c 1.1 97/03/04 14:19:34 + */ + +#include "tclInt.h" +#include "tclPort.h" + +/* + *---------------------------------------------------------------------- + * + * Tcl_Sleep -- + * + * Delay execution for the specified number of milliseconds. + * + * Results: + * None. + * + * Side effects: + * Time passes. + * + *---------------------------------------------------------------------- + */ + +void +Tcl_Sleep(ms) + int ms; /* Number of milliseconds to sleep. */ +{ + static struct timeval delay; + Tcl_Time before, after; + + /* + * The only trick here is that select appears to return early + * under some conditions, so we have to check to make sure that + * the right amount of time really has elapsed. If it's too + * early, go back to sleep again. + */ + + TclpGetTime(&before); + after = before; + after.sec += ms/1000; + after.usec += (ms%1000)*1000; + if (after.usec > 1000000) { + after.usec -= 1000000; + after.sec += 1; + } + while (1) { + delay.tv_sec = after.sec - before.sec; + delay.tv_usec = after.usec - before.usec; + if (delay.tv_usec < 0) { + delay.tv_usec += 1000000; + delay.tv_sec -= 1; + } + + /* + * Special note: must convert delay.tv_sec to int before comparing + * to zero, since delay.tv_usec is unsigned on some platforms. + */ + + if ((((int) delay.tv_sec) < 0) + || ((delay.tv_usec == 0) && (delay.tv_sec == 0))) { + break; + } + (void) select(0, (SELECT_MASK *) 0, (SELECT_MASK *) 0, + (SELECT_MASK *) 0, &delay); + TclpGetTime(&before); + } +} |