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/*
* Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
*/
#include "plpa_config.h"
#include "plpa.h"
#include "plpa_internal.h"
#include <errno.h>
#include <pthread.h>
/* Global variables */
int PLPA_NAME(initialized) = 0;
/* Local variables */
static int refcount = 0;
static pthread_mutex_t mutex;
/* Central clearing point for all parts of PLPA that need to be
initialized. It is erroneous to call this function by more than
one thread simultaneously. */
int PLPA_NAME(init)(void)
{
int ret;
/* If we're already initialized, simply increase the refcount */
if (PLPA_NAME(initialized)) {
pthread_mutex_lock(&mutex);
++refcount;
pthread_mutex_unlock(&mutex);
return 0;
}
/* Otherwise, initialize all the sybsystems */
if (0 != (ret = pthread_mutex_init(&mutex, NULL)) ||
0 != (ret = PLPA_NAME(api_probe_init)()) ||
0 != (ret = PLPA_NAME(set_cache_behavior)(PLPA_NAME_CAPS(CACHE_USE)))) {
return ret;
}
PLPA_NAME(initialized) = 1;
refcount = 1;
return 0;
}
/* Central clearing point for all parts of PLPA that need to be
shutdown. */
int PLPA_NAME(finalize)(void)
{
int val;
/* If we're not initialized, return an error */
if (!PLPA_NAME(initialized)) {
return ENOENT;
}
/* Decrement and check the refcount. If it's nonzero, then simply
return success. */
pthread_mutex_lock(&mutex);
val = --refcount;
pthread_mutex_unlock(&mutex);
if (0 != val) {
return 0;
}
/* Ok, we're the last one. Cleanup. */
PLPA_NAME(set_cache_behavior)(PLPA_NAME_CAPS(CACHE_IGNORE));
pthread_mutex_destroy(&mutex);
PLPA_NAME(initialized) = 0;
return 0;
}
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