test/testlock.c
author Sam Lantinga <slouken@libsdl.org>
Thu, 07 Dec 2017 16:08:09 -0800
changeset 11730 ac6c607e065c
parent 10737 3406a0f8b041
child 11811 5d94cb6b24d3
permissions -rw-r--r--
Enable building the Metal renderer by default, and weak link the Metal framework so the SDL library is safe to use on older Macs
Also generate iOS versions of the Metal shaders
     1 /*
     2   Copyright (C) 1997-2017 Sam Lantinga <slouken@libsdl.org>
     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 /* Test the thread and mutex locking functions
    14    Also exercises the system's signal/thread interaction
    15 */
    16 
    17 #include <signal.h>
    18 #include <stdio.h>
    19 #include <stdlib.h> /* for atexit() */
    20 
    21 #include "SDL.h"
    22 
    23 static SDL_mutex *mutex = NULL;
    24 static SDL_threadID mainthread;
    25 static SDL_Thread *threads[6];
    26 static SDL_atomic_t doterminate;
    27 
    28 /*
    29  * SDL_Quit() shouldn't be used with atexit() directly because
    30  *  calling conventions may differ...
    31  */
    32 static void
    33 SDL_Quit_Wrapper(void)
    34 {
    35     SDL_Quit();
    36 }
    37 
    38 void
    39 printid(void)
    40 {
    41     SDL_Log("Process %lu:  exiting\n", SDL_ThreadID());
    42 }
    43 
    44 void
    45 terminate(int sig)
    46 {
    47     signal(SIGINT, terminate);
    48     SDL_AtomicSet(&doterminate, 1);
    49 }
    50 
    51 void
    52 closemutex(int sig)
    53 {
    54     SDL_threadID id = SDL_ThreadID();
    55     int i;
    56     SDL_Log("Process %lu:  Cleaning up...\n", id == mainthread ? 0 : id);
    57     SDL_AtomicSet(&doterminate, 1);
    58     for (i = 0; i < 6; ++i)
    59         SDL_WaitThread(threads[i], NULL);
    60     SDL_DestroyMutex(mutex);
    61     exit(sig);
    62 }
    63 
    64 int SDLCALL
    65 Run(void *data)
    66 {
    67     if (SDL_ThreadID() == mainthread)
    68         signal(SIGTERM, closemutex);
    69     while (!SDL_AtomicGet(&doterminate)) {
    70         SDL_Log("Process %lu ready to work\n", SDL_ThreadID());
    71         if (SDL_LockMutex(mutex) < 0) {
    72             SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't lock mutex: %s", SDL_GetError());
    73             exit(1);
    74         }
    75         SDL_Log("Process %lu, working!\n", SDL_ThreadID());
    76         SDL_Delay(1 * 1000);
    77         SDL_Log("Process %lu, done!\n", SDL_ThreadID());
    78         if (SDL_UnlockMutex(mutex) < 0) {
    79             SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't unlock mutex: %s", SDL_GetError());
    80             exit(1);
    81         }
    82         /* If this sleep isn't done, then threads may starve */
    83         SDL_Delay(10);
    84     }
    85     if (SDL_ThreadID() == mainthread && SDL_AtomicGet(&doterminate)) {
    86         SDL_Log("Process %lu:  raising SIGTERM\n", SDL_ThreadID());
    87         raise(SIGTERM);
    88     }
    89     return (0);
    90 }
    91 
    92 int
    93 main(int argc, char *argv[])
    94 {
    95     int i;
    96     int maxproc = 6;
    97 
    98     /* Enable standard application logging */
    99     SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
   100 
   101     /* Load the SDL library */
   102     if (SDL_Init(0) < 0) {
   103         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "%s\n", SDL_GetError());
   104         exit(1);
   105     }
   106     atexit(SDL_Quit_Wrapper);
   107 
   108     SDL_AtomicSet(&doterminate, 0);
   109 
   110     if ((mutex = SDL_CreateMutex()) == NULL) {
   111         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create mutex: %s\n", SDL_GetError());
   112         exit(1);
   113     }
   114 
   115     mainthread = SDL_ThreadID();
   116     SDL_Log("Main thread: %lu\n", mainthread);
   117     atexit(printid);
   118     for (i = 0; i < maxproc; ++i) {
   119         char name[64];
   120         SDL_snprintf(name, sizeof (name), "Worker%d", i);
   121         if ((threads[i] = SDL_CreateThread(Run, name, NULL)) == NULL)
   122             SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create thread!\n");
   123     }
   124     signal(SIGINT, terminate);
   125     Run(NULL);
   126 
   127     return (0);                 /* Never reached */
   128 }