lib: add pthread cond implementation

lib/cond.c

@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2024 OpenSIPS Solutions
+ *
+ * This file is part of opensips, a free SIP server.
+ *
+ * opensips is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version
+ *
+ * opensips is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "cond.h"
+#include "../dprint.h"
+
+int cond_init(gen_cond_t *cond)
+{
+	int ret = -1;
+	pthread_condattr_t cattr;
+	pthread_mutexattr_t mattr;
+
+	if (pthread_mutexattr_init(&mattr) != 0) {
+		LM_ERR("could not initialize mutex attributes\n");
+		return -1;
+	}
+	if (pthread_mutexattr_setpshared(&mattr, PTHREAD_PROCESS_SHARED) != 0) {
+		LM_ERR("could not mark mutex attribute as shared\n");
+		goto mutex_error;
+	}
+	if (pthread_mutexattr_setrobust(&mattr, PTHREAD_MUTEX_ROBUST) != 0) {
+		LM_ERR("could not mark mutex attribute as robust\n");
+		goto mutex_error;
+	}
+	if (pthread_mutex_init(&cond->m, &mattr) != 0) {
+		LM_ERR("could not initialize mutex\n");
+		goto mutex_error;
+	}
+	if (pthread_condattr_init(&cattr) != 0) {
+		LM_ERR("could not initialize cond attributes\n");
+		goto cond_error;
+	}
+	if (pthread_condattr_setpshared(&cattr, PTHREAD_PROCESS_SHARED) != 0) {
+		LM_ERR("could not mark mutex cond as shared\n");
+		goto cond_error;
+	}
+	if (pthread_cond_init(&cond->c, &cattr) != 0) {
+		LM_ERR("could not initialize cond\n");
+		goto cond_error;
+	}
+	return 0;
+cond_error:
+	pthread_condattr_destroy(&cattr);
+mutex_error:
+	pthread_mutexattr_destroy(&mattr);
+	return ret;
+}
+
+void cond_destroy(gen_cond_t *cond)
+{
+	pthread_cond_destroy(&cond->c);
+	pthread_mutex_destroy(&cond->m);
+}

lib/cond.h

@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2024 OpenSIPS Solutions
+ *
+ * This file is part of opensips, a free SIP server.
+ *
+ * opensips is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version
+ *
+ * opensips is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __OSIPS_COND__
+#define __OSIPS_COND__
+
+#include <pthread.h>
+
+typedef struct gen_cond {
+	pthread_mutex_t m;
+	pthread_cond_t c;
+} gen_cond_t;
+
+/* initializes a condition allocated in shared memory */
+int cond_init(gen_cond_t *cond);
+
+/* destroyes a condition */
+void cond_destroy(gen_cond_t *cond);
+
+#define cond_lock(_c) pthread_mutex_lock(&(_c)->m)
+#define cond_unlock(_c) pthread_mutex_unlock(&(_c)->m)
+#define cond_wait(_c) pthread_cond_wait(&(_c)->c, &(_c)->m)
+/* make sure we reset the errno, to avoid confusion when resumed */
+#define cond_timedwait(_c, _ts) \
+	do { \
+		errno = 0; \
+		pthread_cond_timedwait(&(_c)->c, &(_c)->m, (_ts)); \
+	} while (0)
+#define cond_has_timedout(_c) (errno == ETIMEDOUT || errno == EAGAIN)/* TODO do we need to store this during wait? */
+#define cond_signal(_c) pthread_cond_signal(&(_c)->c)
+#define cond_broadcast(_c) pthread_cond_broadcast(&(_c)->c)
+
+#endif /* __OSIPS_COND__ */