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Use barrier instead of mutex

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Barrier is supposed to be used in situation like this
and replace tricky mutex usage, where mutex has been unlocked
by a different thread than the locking thread.
This commit is contained in:
Zdenek Kabelac 2011-10-11 09:26:04 +00:00
parent 61a45c7b3a
commit 96de8adcc9
2 changed files with 8 additions and 9 deletions
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1
WHATS_NEW
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@ -1,5 +1,6 @@
Version 2.02.89 -
==================================
Use pthread_barrier to synchronize clvmd threads at startup.
Limit clvmd's thread size to 128KiB.
Reduce default preallocated stack size to 64KiB.
Add check for access through NULL pointer when refresh_filter() fails.

16
daemons/clvmd/clvmd.c
View File

@ -89,7 +89,7 @@ static const size_t STACK_SIZE = 128 * 1024;
static pthread_attr_t stack_attr;
static pthread_mutex_t lvm_thread_mutex;
static pthread_cond_t lvm_thread_cond;
static pthread_mutex_t lvm_start_mutex;
static pthread_barrier_t lvm_start_barrier;
static struct dm_list lvm_cmd_head;
static volatile sig_atomic_t quit = 0;
static volatile sig_atomic_t reread_config = 0;
@ -505,7 +505,7 @@ int main(int argc, char *argv[])
}
pthread_mutex_init(&lvm_thread_mutex, NULL);
pthread_cond_init(&lvm_thread_cond, NULL);
pthread_mutex_init(&lvm_start_mutex, NULL);
pthread_barrier_init(&lvm_start_barrier, NULL, 2);
init_lvhash();
/* Start the cluster interface */
@ -584,9 +584,11 @@ int main(int argc, char *argv[])
DEBUGLOG("starting LVM thread\n");
/* Don't let anyone else to do work until we are started */
pthread_mutex_lock(&lvm_start_mutex);
pthread_create(&lvm_thread, &stack_attr, lvm_thread_fn, &lvm_params);
/* Don't start until the LVM thread is ready */
pthread_barrier_wait(&lvm_start_barrier);
/* Tell the rest of the cluster our version number */
if (clops->cluster_init_completed)
clops->cluster_init_completed();
@ -1633,11 +1635,6 @@ static __attribute__ ((noreturn)) void *pre_and_post_thread(void *arg)
DEBUGLOG("in sub thread: client = %p\n", client);
pthread_mutex_lock(&client->bits.localsock.mutex);
/* Don't start until the LVM thread is ready */
pthread_mutex_lock(&lvm_start_mutex);
pthread_mutex_unlock(&lvm_start_mutex);
DEBUGLOG("Sub thread ready for work.\n");
/* Ignore SIGUSR1 (handled by master process) but enable
SIGUSR2 (kills subthreads) */
sigemptyset(&ss);
@ -2004,7 +2001,8 @@ static void *lvm_thread_fn(void *arg)
init_clvm(lvm_params->excl_uuid);
/* Allow others to get moving */
pthread_mutex_unlock(&lvm_start_mutex);
pthread_barrier_wait(&lvm_start_barrier);
DEBUGLOG("Sub thread ready for work.\n");
/* Now wait for some actual work */
while (!quit) {