sync.c
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/*************************************************************************
*
* File: sync.c
*
* This file contains the routines to manage synchronization between threads
* by using system locks
*
* $Header: /root/leakn64/depot/rf/sw/n64os20l/iosim/src/sync.c,v 1.2 2002/05/30 05:52:50 whs Exp $
*
*/
#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include "sync.h"
#ifdef __sgi__
/***************************************************************************
* Extern variables
*/
/***************************************************************************
* Global variables
*/
usptr_t *SyncArena;
ulock_t SyncLock[MAX_LOCK];
/***************************************************************************
* Create arena for synchronization
*/
static ulock_t
getNewLock(void)
{
static ulock_t lock;
if ((lock = usnewlock(SyncArena)) == NULL) {
perror("usnewlock");
return(NULL);
}
return(lock);
} /* getNewLock */
#endif
void
SyncInit(void)
{
#ifdef __sgi__
int i;
char *tmpdir;
char arenafile[_POSIX_PATH_MAX];
if ((tmpdir = getenv("TMPDIR")) != NULL)
strcpy(arenafile, tmpdir);
else
strcpy(arenafile, "/tmp");
strcat(arenafile, "/emXXXXXX");
mktemp(arenafile);
if ((SyncArena = usinit(arenafile)) == NULL) {
fprintf(stderr, "SyncInit: usinit(%s) failed: %s\n",
arenafile, sys_errlist[errno]);
exit(1);
}
if (unlink(arenafile) == -1) {
fprintf(stderr, "SyncInit: unlink(%s) failed: %s\n",
arenafile, sys_errlist[errno]);
exit(1);
}
for (i = 0; i < MAX_LOCK; i++) {
if ((SyncLock[i] = usnewlock(SyncArena)) == NULL) {
perror("usnewlock");
exit(1);
}
}
#endif
} /* SyncInit */
#ifdef __sgi__
int
LockSet(ulock_t lock)
{
if (ussetlock(lock) == -1) {
perror("ussetlock");
return(-1);
}
return(0);
}
int
LockReset(ulock_t lock)
{
if (usunsetlock(lock) == -1) {
perror("usnsetlock");
return(-1);
}
return(0);
}
void
SysLockSet(void)
{
if (ussetlock(SYS_LOCK) == -1) {
perror("ussetlock");
return;
}
}
void
SysLockReset(void)
{
if (usunsetlock(SYS_LOCK) == -1) {
perror("usnsetlock");
return;
}
}
#endif
#ifdef fprintf
#undef fprintf
#endif
/*
* Logging to file with time and pid stamp; also, uses semaphore locking
*/
int
LogPrintf(FILE *stream, const char *format, ...)
{
va_list ap;
time_t t;
char s1[240];
char s2[160];
va_start(ap, format);
#ifdef LOG_TIME
t = time(NULL);
strftime(s1, sizeof(s1), "%T: ", localtime(&t));
sprintf(s2, "%5d: ", getpid());
strcat(s1, s2);
vsprintf(s2, format, ap);
strcat(s1, s2);
#else
sprintf(s1, "%5d: ", getpid());
vsprintf(s2, format, ap);
strcat(s1, s2);
#endif
#ifdef __sgi__
ussetlock(LOG_LOCK);
#endif
fprintf(stream, s1);
fflush (stream);
#ifdef __sgi__
usunsetlock(LOG_LOCK);
#endif
va_end(ap);
} /* LogPrintf */