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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright Collabora Ltd., 2021
*
* futex cmp requeue test by André Almeida <andrealmeid@collabora.com>
*/
#include <pthread.h>
#include <sys/shm.h>
#include <sys/mman.h>
#include <fcntl.h>
#include "logging.h"
#include "futextest.h"
#define TEST_NAME "futex-wait"
#define timeout_ns 30000000
#define WAKE_WAIT_US 10000
#define SHM_PATH "futex_shm_file"
void *futex;
void usage(char *prog)
{
printf("Usage: %s\n", prog);
printf(" -c Use color\n");
printf(" -h Display this help message\n");
printf(" -v L Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
VQUIET, VCRITICAL, VINFO);
}
static void *waiterfn(void *arg)
{
struct timespec to;
unsigned int flags = 0;
if (arg)
flags = *((unsigned int *) arg);
to.tv_sec = 0;
to.tv_nsec = timeout_ns;
if (futex_wait(futex, 0, &to, flags))
printf("waiter failed errno %d\n", errno);
return NULL;
}
int main(int argc, char *argv[])
{
int res, ret = RET_PASS, fd, c, shm_id;
u_int32_t f_private = 0, *shared_data;
unsigned int flags = FUTEX_PRIVATE_FLAG;
pthread_t waiter;
void *shm;
futex = &f_private;
while ((c = getopt(argc, argv, "cht:v:")) != -1) {
switch (c) {
case 'c':
log_color(1);
break;
case 'h':
usage(basename(argv[0]));
exit(0);
case 'v':
log_verbosity(atoi(optarg));
break;
default:
usage(basename(argv[0]));
exit(1);
}
}
ksft_print_header();
ksft_set_plan(3);
ksft_print_msg("%s: Test futex_wait\n", basename(argv[0]));
/* Testing a private futex */
info("Calling private futex_wait on futex: %p\n", futex);
if (pthread_create(&waiter, NULL, waiterfn, (void *) &flags))
error("pthread_create failed\n", errno);
usleep(WAKE_WAIT_US);
info("Calling private futex_wake on futex: %p\n", futex);
res = futex_wake(futex, 1, FUTEX_PRIVATE_FLAG);
if (res != 1) {
ksft_test_result_fail("futex_wake private returned: %d %s\n",
errno, strerror(errno));
ret = RET_FAIL;
} else {
ksft_test_result_pass("futex_wake private succeeds\n");
}
/* Testing an anon page shared memory */
shm_id = shmget(IPC_PRIVATE, 4096, IPC_CREAT | 0666);
if (shm_id < 0) {
perror("shmget");
exit(1);
}
shared_data = shmat(shm_id, NULL, 0);
*shared_data = 0;
futex = shared_data;
info("Calling shared (page anon) futex_wait on futex: %p\n", futex);
if (pthread_create(&waiter, NULL, waiterfn, NULL))
error("pthread_create failed\n", errno);
usleep(WAKE_WAIT_US);
info("Calling shared (page anon) futex_wake on futex: %p\n", futex);
res = futex_wake(futex, 1, 0);
if (res != 1) {
ksft_test_result_fail("futex_wake shared (page anon) returned: %d %s\n",
errno, strerror(errno));
ret = RET_FAIL;
} else {
ksft_test_result_pass("futex_wake shared (page anon) succeeds\n");
}
/* Testing a file backed shared memory */
fd = open(SHM_PATH, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
if (fd < 0) {
perror("open");
exit(1);
}
if (ftruncate(fd, sizeof(f_private))) {
perror("ftruncate");
exit(1);
}
shm = mmap(NULL, sizeof(f_private), PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (shm == MAP_FAILED) {
perror("mmap");
exit(1);
}
memcpy(shm, &f_private, sizeof(f_private));
futex = shm;
info("Calling shared (file backed) futex_wait on futex: %p\n", futex);
if (pthread_create(&waiter, NULL, waiterfn, NULL))
error("pthread_create failed\n", errno);
usleep(WAKE_WAIT_US);
info("Calling shared (file backed) futex_wake on futex: %p\n", futex);
res = futex_wake(shm, 1, 0);
if (res != 1) {
ksft_test_result_fail("futex_wake shared (file backed) returned: %d %s\n",
errno, strerror(errno));
ret = RET_FAIL;
} else {
ksft_test_result_pass("futex_wake shared (file backed) succeeds\n");
}
/* Freeing resources */
shmdt(shared_data);
munmap(shm, sizeof(f_private));
remove(SHM_PATH);
close(fd);
ksft_print_cnts();
return ret;
}
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