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tsafe: change fork() override to pthread_atfork() callbacks.

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git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@2677 fd59a12c-fef9-0310-b244-a6a79926bd2f
This commit is contained in:
Angus Salkeld 2010-03-09 21:59:24 +00:00
parent 009dfc090e
commit 92ade89db6
1 changed files with 24 additions and 20 deletions
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44
exec/tsafe.c
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@ -80,6 +80,9 @@
static int tsafe_disabled = 1;
static int tsafe_inited = 0;
static char **coro_environ;
static void atfork_prepare (void);
static void atfork_parent (void);
static void atfork_child (void);
#if defined(HAVE_PTHREAD_SPIN_LOCK)
static pthread_spinlock_t tsafe_enabled_mutex;
@ -105,11 +108,13 @@ void tsafe_init (char **envp)
#if defined(HAVE_PTHREAD_SPIN_LOCK)
pthread_spin_init (&tsafe_enabled_mutex, 0);
#endif
pthread_atfork (atfork_prepare, atfork_parent,atfork_child);
tsafe_disabled = 1;
tsafe_inited = 1;
}
static void tsafe_lock (void)
{
#if defined(HAVE_PTHREAD_SPIN_LOCK)
@ -118,6 +123,7 @@ static void tsafe_lock (void)
pthread_mutex_lock (&tsafe_enabled_mutex);
#endif
}
static void tsafe_unlock (void)
{
#if defined(HAVE_PTHREAD_SPIN_LOCK)
@ -141,6 +147,23 @@ void tsafe_on (void)
tsafe_unlock ();
}
static void atfork_prepare (void)
{
tsafe_lock ();
}
static void atfork_parent (void)
{
tsafe_unlock ();
}
static void atfork_child (void)
{
if (tsafe_inited && !tsafe_disabled) {
tsafe_disabled = 1;
}
tsafe_unlock ();
}
static void* _get_real_func_(const char * func_name)
{
@ -182,25 +205,6 @@ int pthread_create(pthread_t *thread, const pthread_attr_t *attr,
return real_pthread_create (thread, attr, start_routine, arg);
}
pid_t fork(void)
{
static pid_t (*real_fork)(void) = NULL;
pid_t ret;
if (tsafe_inited && !tsafe_disabled) {
tsafe_off ();
}
if (real_fork == NULL) {
real_fork = _get_real_func_ ("fork");
}
ret = real_fork ();
if (ret == 0) {
/* if we have forked corosync then anything goes. */
tsafe_off ();
}
return ret;
}
#endif /* COROSYNC_LINUX */
/*