1// testing cancellation points
2#include <errno.h>
3#include <pthread.h>
4#include <semaphore.h>
5#include <string.h>
6#include <sys/mman.h>
7#include <fcntl.h>
8#include <unistd.h>
9#include "test.h"
10
11#define TESTC(c, m) ( (c) || (t_error(#c " failed (%s, " m ")\n", cdescr), 0) )
12#define TESTR(f, m) do {int r; \
13	if ((r = (f))) t_error(#f " failed: %s (%s, " m ")\n", strerror(r), cdescr); } while (0)
14#define TESTE(f, m) do { \
15	if ((f)==-1) t_error(#f " failed: %s (%s, " m ")\n", strerror(errno), cdescr); } while (0)
16
17static sem_t sem_seq, sem_test;
18
19static int seqno;
20
21static const char *cdescr = "global initialization";
22
23static void prepare_sem(void *arg)
24{
25	TESTR(sem_init(&sem_test, 0, (long)arg), "creating semaphore");
26}
27
28static void cleanup_sem(void *arg)
29{
30	TESTR(sem_destroy(&sem_test), "destroying semaphore");
31}
32
33static void execute_sem_wait(void *arg)
34{
35	TESTR(sem_wait(&sem_test), "waiting on semaphore in the canceled thread");
36}
37
38static void execute_sem_timedwait(void *arg)
39{
40	struct timespec ts;
41	clock_gettime(CLOCK_REALTIME, &ts);
42	ts.tv_sec += 1;
43	TESTR(sem_timedwait(&sem_test, &ts), "timed-waiting on semaphore in the canceled thread");
44}
45
46static pthread_t td_test;
47
48static void *run_test(void *arg)
49{
50	while (sem_wait(&sem_test));
51	return 0;
52}
53
54static void prepare_thread(void *arg)
55{
56	prepare_sem(arg);
57	TESTR(pthread_create(&td_test, 0, run_test, 0), "creating auxiliary thread");
58}
59
60static void cleanup_thread(void *arg)
61{
62	void *res;
63	if (td_test) {
64		TESTR(sem_post(&sem_test), "posting semaphore");
65		TESTR(pthread_join(td_test, &res), "joining auxiliary thread");
66		TESTC(res == 0, "auxiliary thread exit status");
67	}
68	cleanup_sem(arg);
69}
70
71static void execute_thread_join(void *arg)
72{
73	TESTR(pthread_join(td_test, 0), "joining in the canceled thread");
74	td_test = 0;
75}
76
77static void prepare_dummy(void *arg)
78{
79}
80
81static void execute_shm_open(void *arg)
82{
83	int *fd = arg;
84	TESTE(*fd = shm_open("/testshm", O_RDWR|O_CREAT, 0666), "");
85}
86
87static void cleanup_shm(void *arg)
88{
89	int *fd = arg;
90	if (*fd > 0) {
91		TESTE(close(*fd), "shm fd");
92		TESTE(shm_unlink("/testshm"), "");
93	}
94}
95
96static struct {
97	int want_cancel;
98	void (*prepare)(void *);
99	void (*execute)(void *);
100	void (*cleanup)(void *);
101	void *arg;
102	const char *descr;
103} scenarios[] = {
104	{1, prepare_sem, execute_sem_wait, cleanup_sem, 0, "blocking sem_wait"},
105	{1, prepare_sem, execute_sem_wait, cleanup_sem, (void*)1, "non-blocking sem_wait"},
106	{1, prepare_sem, execute_sem_timedwait, cleanup_sem, 0, "blocking sem_timedwait"},
107	{1, prepare_sem, execute_sem_timedwait, cleanup_sem, (void*)1, "non-blocking sem_timedwait"},
108	{1, prepare_thread, execute_thread_join, cleanup_thread, 0, "blocking pthread_join"},
109	{1, prepare_thread, execute_thread_join, cleanup_thread, (void*)1, "non-blocking pthread_join"},
110	{0, prepare_dummy, execute_shm_open, cleanup_shm, &(int){0}, "shm_open"},
111	{ 0 }
112}, *cur_sc = scenarios;
113
114static void *run_execute(void *arg)
115{
116	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, 0);
117	while (sem_wait(&sem_seq));
118	pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, 0);
119	seqno = 1;
120	cur_sc->execute(cur_sc->arg);
121	seqno = 2;
122	return 0;
123}
124
125int main(void)
126{
127	TESTR(sem_init(&sem_seq, 0, 0), "creating semaphore");
128
129	for (; cur_sc->prepare; cur_sc++) {
130		pthread_t td;
131		void *res;
132
133		cdescr = cur_sc->descr;
134		cur_sc->prepare(cur_sc->arg);
135		seqno = 0;
136		TESTR(pthread_create(&td, 0, run_execute, 0), "creating thread to be canceled");
137		TESTR(pthread_cancel(td), "canceling");
138		TESTR(sem_post(&sem_seq), "unblocking canceled thread");
139		TESTR(pthread_join(td, &res), "joining canceled thread");
140		if (cur_sc->want_cancel) {
141			TESTC(res == PTHREAD_CANCELED, "canceled thread exit status")
142			&& TESTC(seqno == 1, "seqno");
143		} else {
144			TESTC(res != PTHREAD_CANCELED, "canceled thread exit status")
145			&& TESTC(seqno == 2, "seqno");
146		}
147		cur_sc->cleanup(cur_sc->arg);
148	}
149
150	return t_status;
151}
152