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// Copyright (c) 2018 David Crawshaw <david@zentus.com>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
// This file defines the wait_for_unlock_notify function.
// See the documentation on Stmt.Step.
#include <blocking_step.h>
#include <stdlib.h>
unlock_note* unlock_note_alloc() {
unlock_note* un = (unlock_note*)malloc(sizeof(unlock_note));
pthread_mutex_init(&un->mu, 0);
pthread_cond_init(&un->cond, 0);
return un;
}
void unlock_note_free(unlock_note* un) {
pthread_cond_destroy(&un->cond);
pthread_mutex_destroy(&un->mu);
free(un);
}
void unlock_note_fire(unlock_note* un) {
pthread_mutex_lock(&un->mu);
un->fired = 1;
pthread_cond_signal(&un->cond);
pthread_mutex_unlock(&un->mu);
}
static void unlock_notify_cb(void **apArg, int nArg) {
for(int i=0; i < nArg; i++) {
unlock_note_fire((unlock_note*)apArg[i]);
}
}
int wait_for_unlock_notify(sqlite3 *db, unlock_note* un) {
un->fired = 0;
int res = sqlite3_unlock_notify(db, unlock_notify_cb, (void *)un);
if (res == SQLITE_OK) {
pthread_mutex_lock(&un->mu);
if (!un->fired) {
pthread_cond_wait(&un->cond, &un->mu);
}
pthread_mutex_unlock(&un->mu);
}
return res;
}
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