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Code Issues Releases Wiki Activity

lockfile: Make thread-safe.

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Signed-off-by: Ben Pfaff <blp@nicira.com>
This commit is contained in:
Ben Pfaff
2013-04-15 15:05:19 -07:00
parent d7eea710a0
commit 5947bbe609
1 changed files with 10 additions and 1 deletions
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11
lib/lockfile.c
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@@ -27,6 +27,7 @@
#include "coverage.h"
#include "hash.h"
#include "hmap.h"
#include "ovs-thread.h"
#include "timeval.h"
#include "util.h"
#include "vlog.h"
@@ -54,6 +55,9 @@ struct lockfile {
* once. */
static struct hmap lock_table = HMAP_INITIALIZER(&lock_table);
/* Protects 'lock_table'. */
static pthread_mutex_t lock_table_mutex = PTHREAD_MUTEX_INITIALIZER;
static void lockfile_unhash(struct lockfile *);
static int lockfile_try_lock(const char *name, pid_t *pidp,
struct lockfile **lockfilep);
@@ -106,7 +110,9 @@ lockfile_lock(const char *file, struct lockfile **lockfilep)
lock_name = lockfile_name(file);
xpthread_mutex_lock(&lock_table_mutex);
error = lockfile_try_lock(lock_name, &pid, lockfilep);
xpthread_mutex_unlock(&lock_table_mutex);
if (error) {
COVERAGE_INC(lockfile_error);
@@ -132,8 +138,11 @@ void
lockfile_unlock(struct lockfile *lockfile)
{
if (lockfile) {
COVERAGE_INC(lockfile_unlock);
xpthread_mutex_lock(&lock_table_mutex);
lockfile_unhash(lockfile);
xpthread_mutex_unlock(&lock_table_mutex);
COVERAGE_INC(lockfile_unlock);
free(lockfile->name);
free(lockfile);
}