--- /dev/null
+#ifndef CEPH_ON_EXIT_H
+#define CEPH_ON_EXIT_H
+
+#include <pthread.h>
+#include <assert.h>
+#include <vector>
+
+/*
+ * Create a static instance at the file level to get callbacks called when the
+ * process exits via main() or exit().
+ */
+
+class OnExitManager {
+ public:
+ typedef void (*callback_t)(void *arg);
+
+ OnExitManager() {
+ int ret = pthread_mutex_init(&lock_, NULL);
+ assert(ret == 0);
+ }
+
+ ~OnExitManager() {
+ pthread_mutex_lock(&lock_);
+ std::vector<struct cb>::iterator it;
+ for (it = funcs_.begin(); it != funcs_.end(); it++) {
+ it->func(it->arg);
+ }
+ funcs_.clear();
+ pthread_mutex_unlock(&lock_);
+ }
+
+ void add_callback(callback_t func, void *arg) {
+ pthread_mutex_lock(&lock_);
+ struct cb callback = { func, arg };
+ funcs_.push_back(callback);
+ pthread_mutex_unlock(&lock_);
+ }
+
+ private:
+ struct cb {
+ callback_t func;
+ void *arg;
+ };
+
+ std::vector<struct cb> funcs_;
+ pthread_mutex_t lock_;
+};
+
+#endif