xref: /PHP-8.0/ext/sysvsem/tests/nowait.phpt (revision c5401854) 
1--TEST--
2Test sem_acquire with nowait option
3--SKIPIF--
4<?php
5if(!extension_loaded('sysvsem') || !extension_loaded('pcntl')) {
6    die("skip sysvsem and pcntl required");
7}
8?>
9--FILE--
10<?php
11$P_SEMKEY = ftok(__FILE__, 'P');  //  Parent Semaphore key
12$C_SEMKEY = ftok(__FILE__, 'C');  //  Child Semaphore key
13
14echo "P: parent process running.\n";
15
16pcntl_signal(SIGCHLD, SIG_IGN);
17
18// Get semaphore for parent
19$p_sem_id = sem_get($P_SEMKEY, 1);
20if ($p_sem_id === FALSE) {
21    echo "P: failed to parent get semaphore.\n";
22    exit;
23}
24
25echo "P: got semaphore.\n";
26
27// Get semaphore for child
28$c_sem_id = sem_get($C_SEMKEY, 1);
29if ($c_sem_id === FALSE) {
30    echo "P: failed to child get semaphore.\n";
31    exit;
32}
33
34
35// Acquire semaphore for parent
36if (!sem_acquire($p_sem_id)) {
37    echo "P: fail to acquire semaphore.\n";
38    sem_remove($p_sem_id);
39    exit;
40}
41echo "P: acquired semaphore.\n";
42
43// Acquire semaphore for child
44if (!sem_acquire($c_sem_id)) {
45    echo "P: failed to acquire semaphore.\n";
46    sem_remove($c_sem_id);
47    exit;
48}
49echo "P: acquired semaphore.\n";
50// Fork process
51$pid = pcntl_fork();
52
53if ($pid) {
54
55    register_shutdown_function(function () use ($p_sem_id) {
56        echo "P: removing semaphore.\n";
57        sem_remove($p_sem_id);
58    });
59
60    // Release semaphore after 50ms
61    usleep(50000);
62
63    /* Wait for the child semaphore to be released to
64       to release the parent semaphore */
65    if (!sem_acquire($c_sem_id)) {
66        echo "P: failed to acquire semaphore.\n";
67        exit;
68    }
69
70    /* Release the child semahpore before releasing
71       the releasing the parent semaphore and letting
72       the child continue execution */
73    sem_release($c_sem_id);
74
75    echo "P: releasing semaphore.\n";
76    if (!sem_release($p_sem_id)) {
77        echo "P: failed to release semaphore.\n";
78    }
79
80    $status = null;
81    pcntl_waitpid($pid, $status);
82
83} else {
84
85    register_shutdown_function(function () use ($c_sem_id) {
86        echo "C: removing semaphore.\n";
87        sem_remove($c_sem_id);
88    });
89
90    echo "C: child process running.\n";
91
92    // Have the semaphore after process forked
93    echo "C: got semaphores.\n";
94
95    // This should fail to get to the semaphore and not wait
96    if (sem_acquire($p_sem_id, true)) {
97        echo "C: test failed, Child was able to acquire semaphore.\n";
98        exit;
99    }
100
101    // The child process did not wait to acquire the semaphore
102    echo "C: failed to acquire semaphore.\n";
103
104    echo "C: releasing semaphore.\n";
105    if (!sem_release($c_sem_id)) {
106        echo "C: failed to release semaphore.\n";
107    }
108
109    // Acquire semaphore with waiting
110    if (!sem_acquire($p_sem_id)) {
111        echo "C: fail to acquire semaphore.\n";
112        exit;
113    }
114    echo "C: success acquired semaphore.\n";
115
116    echo "C: releasing semaphore.\n";
117    sem_release($p_sem_id);
118}
119
120?>
121--EXPECT--
122P: parent process running.
123P: got semaphore.
124P: acquired semaphore.
125P: acquired semaphore.
126C: child process running.
127C: got semaphores.
128C: failed to acquire semaphore.
129C: releasing semaphore.
130P: releasing semaphore.
131C: success acquired semaphore.
132C: releasing semaphore.
133C: removing semaphore.
134P: removing semaphore.
135