Atlas - testsem.c
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[FILE BEGIN]
1/*
2  Copyright (C) 1997-2018 Sam Lantinga <[email protected]>
3
4  This software is provided 'as-is', without any express or implied
5  warranty.  In no event will the authors be held liable for any damages
6  arising from the use of this software.
7
8  Permission is granted to anyone to use this software for any purpose,
9  including commercial applications, and to alter it and redistribute it
10  freely.
11*/
12
13/* Simple test of the SDL semaphore code */
14
15#include <stdio.h>
16#include <stdlib.h>
17#include <signal.h>
18
19#include "SDL.h"
20
21#define NUM_THREADS 10
22
23static SDL_sem *sem;
24int alive = 1;
25
26int SDLCALL
27ThreadFunc(void *data)
28{
29    int threadnum = (int) (uintptr_t) data;
30    while (alive) {
31        SDL_SemWait(sem);
32        SDL_Log("Thread number %d has got the semaphore (value = %d)!\n",
33                threadnum, SDL_SemValue(sem));
34        SDL_Delay(200);
35        SDL_SemPost(sem);
36        SDL_Log("Thread number %d has released the semaphore (value = %d)!\n",
37                threadnum, SDL_SemValue(sem));
38        SDL_Delay(1);           /* For the scheduler */
39    }
40    SDL_Log("Thread number %d exiting.\n", threadnum);
41    return 0;
42}
43
44static void
45killed(int sig)
46{
47    alive = 0;
48}
49
50static void
51TestWaitTimeout(void)
52{
53    Uint32 start_ticks;
54    Uint32 end_ticks;
55    Uint32 duration;
56    int retval;
57
58    sem = SDL_CreateSemaphore(0);
59    SDL_Log("Waiting 2 seconds on semaphore\n");
60
61    start_ticks = SDL_GetTicks();
62    retval = SDL_SemWaitTimeout(sem, 2000);
63    end_ticks = SDL_GetTicks();
64
65    duration = end_ticks - start_ticks;
66
67    /* Accept a little offset in the effective wait */
68    if (duration > 1900 && duration < 2050)
69        SDL_Log("Wait done.\n");
70    else
71        SDL_Log("Wait took %d milliseconds\n", duration);
72
73    /* Check to make sure the return value indicates timed out */
74    if (retval != SDL_MUTEX_TIMEDOUT)
75        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL_SemWaitTimeout returned: %d; expected: %d\n", retval, SDL_MUTEX_TIMEDOUT);
76}
77
78int
79main(int argc, char **argv)
80{
81    SDL_Thread *threads[NUM_THREADS];
82    uintptr_t i;
83    int init_sem;
84
85    /* Enable standard application logging */
86    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
87
88    if (argc < 2) {
89        SDL_Log("Usage: %s init_value\n", argv[0]);
90        return (1);
91    }
92
93    /* Load the SDL library */
94    if (SDL_Init(0) < 0) {
95        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
96        return (1);
97    }
98    signal(SIGTERM, killed);
99    signal(SIGINT, killed);
100
101    init_sem = atoi(argv[1]);
102    sem = SDL_CreateSemaphore(init_sem);
103
104    SDL_Log("Running %d threads, semaphore value = %d\n", NUM_THREADS,
105           init_sem);
106    /* Create all the threads */
107    for (i = 0; i < NUM_THREADS; ++i) {
108        char name[64];
109        SDL_snprintf(name, sizeof (name), "Thread%u", (unsigned int) i);
110        threads[i] = SDL_CreateThread(ThreadFunc, name, (void *) i);
111    }
112
113    /* Wait 10 seconds */
114    SDL_Delay(10 * 1000);
115
116    /* Wait for all threads to finish */
117    SDL_Log("Waiting for threads to finish\n");
118    alive = 0;
119    for (i = 0; i < NUM_THREADS; ++i) {
120        SDL_WaitThread(threads[i], NULL);
121    }
122    SDL_Log("Finished waiting for threads\n");
123
124    SDL_DestroySemaphore(sem);
125
126    TestWaitTimeout();
127
128    SDL_Quit();
129    return (0);
130}
131
[FILE END]
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