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/** @file
Parser: commonly functions.
Copyright (c) 2001-2017 Art. Lebedev Studio (http://www.artlebedev.com)
Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
*/
#include "pa_config_includes.h"
#include "pa_os.h"
volatile const char * IDENT_PA_OS_C="$Id: pa_os.C,v 1.18 2017/02/07 22:00:43 moko Exp $" IDENT_PA_OS_H;
unsigned int pa_lock_attempts=PA_LOCK_ATTEMPTS;
#ifdef _MSC_VER
#include <windows.h>
#endif
#ifdef HAVE_FLOCK
#define PA_SH_LOCK LOCK_SH|LOCK_NB
#define PA_EX_LOCK LOCK_EX|LOCK_NB
#define PA_ULOCK LOCK_UN
#define FLOCK(operation) int status=flock(fd, operation);
#else
#ifdef HAVE__LOCKING
#define PA_SH_LOCK _LK_NBLCK
#define PA_EX_LOCK _LK_NBLCK
#define PA_ULOCK _LK_UNLCK
#define FLOCK(operation) lseek(fd, 0, SEEK_SET); int status=_locking(fd, operation, 1);
#else
#ifdef HAVE_FCNTL
#define PA_SH_LOCK F_RDLCK
#define PA_EX_LOCK F_WRLCK
#define PA_ULOCK F_UNLCK
#define FLOCK(operation) struct flock ls={operation, SEEK_SET}; int status=fcntl(fd, F_SETLK, &ls);
#else
#ifdef HAVE_LOCKF
#define PA_SH_LOCK F_TLOCK
#define PA_EX_LOCK F_TLOCK
#define PA_ULOCK F_ULOCK
#define FLOCK(operation) lseek(fd, 0, SEEK_SET); int status=lockf(fd, operation, 1);
#else
#error unable to find file locking func
#endif
#endif
#endif
#endif
int pa_lock(int fd, int attempts, int operation){
while(true){
FLOCK(operation);
if(status==0)
return 0;
if(--attempts<=0)
return errno;
pa_sleep(PA_LOCK_WAIT_TIMEOUT_SECS, PA_LOCK_WAIT_TIMEOUT_USECS);
}
};
int pa_lock_shared_blocking(int fd) {
return pa_lock(fd, pa_lock_attempts, PA_SH_LOCK);
}
int pa_lock_exclusive_blocking(int fd) {
return pa_lock(fd, pa_lock_attempts, PA_EX_LOCK);
}
int pa_lock_exclusive_nonblocking(int fd) {
return pa_lock(fd, 1, PA_EX_LOCK);
}
int pa_unlock(int fd) {
return pa_lock(fd, 1, PA_ULOCK);
}
int pa_sleep(unsigned long secs, unsigned long usecs) {
if(usecs >= 1000000){
secs += usecs/1000000;
usecs = usecs%1000000;
}
#ifdef _MSC_VER
Sleep(secs * 1000 + usecs / 1000);
return 0;
#else
struct timeval t;
t.tv_sec = secs;
t.tv_usec = usecs;
return (select(0, NULL, NULL, NULL, &t)<0 ? errno : 0);
#endif
}
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