From 1cc8c424df17d0b0522615f90717d73e86780a44 Mon Sep 17 00:00:00 2001
From: Szabolcs Nagy <nsz@port70.net>
Date: Sun, 7 Sep 2014 15:40:45 +0200
Subject: [PATCH] cancellation point test by Alexander Monakov

---
 src/functional/pthread_cancel-points.c | 147 +++++++++++++++++++++++++
 1 file changed, 147 insertions(+)
 create mode 100644 src/functional/pthread_cancel-points.c

diff --git a/src/functional/pthread_cancel-points.c b/src/functional/pthread_cancel-points.c
new file mode 100644
index 0000000..2c12ed6
--- /dev/null
+++ b/src/functional/pthread_cancel-points.c
@@ -0,0 +1,147 @@
+// testing cancellation points
+#include <errno.h>
+#include <pthread.h>
+#include <semaphore.h>
+#include <string.h>
+#include <sys/mman.h>
+#include "test.h"
+
+#define TESTC(c, m) ( (c) || (t_error(#c " failed (%s, " m ")\n", cdescr), 0) )
+#define TESTR(f, m) do {int r; \
+	if ((r = (f))) t_error(#f " failed: %s (%s, " m ")\n", strerror(r), cdescr); } while (0)
+#define TESTE(f, m) do { \
+	if ((f)==-1) t_error(#f " failed: %s (%s, " m ")\n", strerror(errno), cdescr); } while (0)
+
+static sem_t sem_seq, sem_test;
+
+static int seqno;
+
+static const char *cdescr = "global initialization";
+
+static void prepare_sem(void *arg)
+{
+	TESTR(sem_init(&sem_test, 0, (long)arg), "creating semaphore");
+}
+
+static void cleanup_sem(void *arg)
+{
+	TESTR(sem_post(&sem_test), "posting semaphore");
+	TESTR(sem_destroy(&sem_test), "destroying semaphore");
+}
+
+static void execute_sem_wait(void *arg)
+{
+	TESTR(sem_wait(&sem_test), "waiting on semaphore in the canceled thread");
+}
+
+static void execute_sem_timedwait(void *arg)
+{
+	struct timespec ts;
+	clock_gettime(CLOCK_REALTIME, &ts);
+	ts.tv_sec += 1;
+	TESTR(sem_timedwait(&sem_test, &ts), "timed-waiting on semaphore in the canceled thread");
+}
+
+static pthread_t td_test;
+
+static void *run_test(void *arg)
+{
+	while (sem_wait(&sem_test));
+	return 0;
+}
+
+static void prepare_thread(void *arg)
+{
+	prepare_sem(arg);
+	TESTR(pthread_create(&td_test, 0, run_test, 0), "creating auxiliary thread");
+}
+
+static void cleanup_thread(void *arg)
+{
+	void *res;
+	cleanup_sem(arg);
+	if (!td_test)
+		return;
+	TESTR(pthread_join(td_test, &res), "joining auxiliary thread");
+	TESTC(res == 0, "auxiliary thread exit status");
+}
+
+static void execute_thread_join(void *arg)
+{
+	TESTR(pthread_join(td_test, 0), "joining in the canceled thread");
+	td_test = 0;
+}
+
+static void prepare_dummy(void *arg)
+{
+}
+
+static void execute_shm_open(void *arg)
+{
+	int *fd = arg;
+	TESTE(*fd = shm_open("/testshm", O_RDWR|O_CREAT, 0666), "");
+}
+
+static void cleanup_shm(void *arg)
+{
+	int *fd = arg;
+	TESTE(close(*fd), "shm fd");
+	TESTE(shm_unlink("/testshm"), "");
+}
+
+static struct {
+	int want_cancel;
+	void (*prepare)(void *);
+	void (*execute)(void *);
+	void (*cleanup)(void *);
+	void *arg;
+	const char *descr;
+} scenarios[] = {
+	{1, prepare_sem, execute_sem_wait, cleanup_sem, 0, "blocking sem_wait"},
+	{1, prepare_sem, execute_sem_wait, cleanup_sem, (void*)1, "non-blocking sem_wait"},
+	{1, prepare_sem, execute_sem_timedwait, cleanup_sem, 0, "blocking sem_timedwait"},
+	{1, prepare_sem, execute_sem_timedwait, cleanup_sem, (void*)1, "non-blocking sem_timedwait"},
+	{1, prepare_thread, execute_thread_join, cleanup_thread, 0, "blocking pthread_join"},
+	{1, prepare_thread, execute_thread_join, cleanup_thread, (void*)1, "non-blocking pthread_join"},
+	{0, prepare_dummy, execute_shm_open, cleanup_shm, &(int){0}, "shm_open"},
+	{ 0 }
+}, *cur_sc = scenarios;
+
+static void *run_execute(void *arg)
+{
+	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, 0);
+	while (sem_wait(&sem_seq));
+	pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, 0);
+	seqno = 1;
+	cur_sc->execute(cur_sc->arg);
+	seqno = 2;
+	return 0;
+}
+
+int main(void)
+{
+	TESTR(sem_init(&sem_seq, 0, 0), "creating semaphore");
+
+	for (; cur_sc->prepare; cur_sc++) {
+		pthread_t td;
+		void *res;
+
+		cdescr = cur_sc->descr;
+		cur_sc->prepare(cur_sc->arg);
+		seqno = 0;
+		TESTR(pthread_create(&td, 0, run_execute, 0), "creating thread to be canceled");
+		TESTR(pthread_cancel(td), "canceling");
+		TESTR(sem_post(&sem_seq), "unblocking canceled thread");
+		TESTR(pthread_join(td, &res), "joining canceled thread");
+		if (cur_sc->want_cancel) {
+			TESTC(res == PTHREAD_CANCELED, "canceled thread exit status")
+			&& TESTC(seqno == 1, "seqno");
+		} else {
+			TESTC(res != PTHREAD_CANCELED, "canceled thread exit status")
+			&& TESTC(seqno == 2, "seqno");
+		}
+		cur_sc->cleanup(cur_sc->arg);
+	}
+
+	return t_status;
+}
-- 
2.20.1