lock.c File Reference

#include <rz_userconf.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <rz_util/rz_sys.h>
#include "sdb.h"

Go to the source code of this file.

Functions
RZ_API const char *	sdb_lock_file (const char *f)
RZ_API bool	sdb_lock (const char *s)
RZ_API int	sdb_lock_wait (const char *s)
RZ_API void	sdb_unlock (const char *s)

Function Documentation

sdb_lock()

RZ_API bool sdb_lock

(

const char *

s

)

Definition at line 29 of file lock.c.

                                    {
    int fd;
    char *pid, pidstr[64];
    if (!s) {
        return false;
    }
    fd = open(s, O_CREAT | O_TRUNC | O_WRONLY | O_EXCL, SDB_MODE);
    if (fd == -1) {
        return false;
    }
    pid = sdb_itoa(rz_sys_getpid(), pidstr, 10);
    if (pid) {
        if ((write(fd, pid, strlen(pid)) < 0) || (write(fd, "\n", 1) < 0)) {
            close(fd);
            return false;
        }
    }
    close(fd);
    return true;
}

References close, fd, O_CREAT, O_EXCL, O_TRUNC, O_WRONLY, pid, rz_sys_getpid(), s, sdb_itoa(), SDB_MODE, and write.

Referenced by sdb_file(), sdb_lock_wait(), and sdb_new().

sdb_lock_file()

RZ_API const char* sdb_lock_file

(

const char *

f

)

Definition at line 14 of file lock.c.

                                                {
    static char buf[128];
    size_t len;
    if (!f || !*f) {
        return NULL;
    }
    len = strlen(f);
    if (len + 10 > sizeof buf) {
        return NULL;
    }
    memcpy(buf, f, len);
    strcpy(buf + len, ".lock");
    return buf;
}

References f, len, memcpy(), and NULL.

Referenced by sdb_file(), sdb_fini(), and sdb_new().

sdb_lock_wait()

RZ_API int sdb_lock_wait

(

const char *

s

)

Definition at line 50 of file lock.c.

                                        {
    // TODO use flock() here
    // wait forever here?
    while (!sdb_lock(s)) {
        // TODO: if waiting too much return 0
        rz_sys_sleep(1);
    }
    return 1;
}

References rz_sys_sleep(), s, and sdb_lock().

Referenced by sdb_new().

sdb_unlock()

RZ_API void sdb_unlock

(

const char *

s

)

Definition at line 60 of file lock.c.

                                      {
    // flock (fd, LOCK_UN);
    unlink(s);
}

References s, and unlink.

Referenced by sdb_file(), and sdb_fini().