SDL 2.0
testsem.c File Reference
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include "SDL.h"
+ Include dependency graph for testsem.c:

Go to the source code of this file.

Macros

#define NUM_THREADS   10
 

Functions

int ThreadFunc (void *data)
 
static void killed (int sig)
 
static void TestWaitTimeout (void)
 
int main (int argc, char **argv)
 

Variables

static SDL_sem * sem
 
int alive = 1
 

Macro Definition Documentation

◆ NUM_THREADS

#define NUM_THREADS   10

Definition at line 21 of file testsem.c.

Function Documentation

◆ killed()

static void killed ( int  sig)
static

Definition at line 45 of file testsem.c.

46{
47 alive = 0;
48}
int alive
Definition: testsem.c:24

References alive.

Referenced by main().

◆ main()

int main ( int  argc,
char **  argv 
)

Definition at line 79 of file testsem.c.

80{
83 int init_sem;
84
85 /* Enable standard application logging */
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) {
121 }
122 SDL_Log("Finished waiting for threads\n");
123
125
127
128 SDL_Quit();
129 return (0);
130}
unsigned int uintptr_t
#define SDL_GetError
#define SDL_CreateThread
#define SDL_DestroySemaphore
#define SDL_LogSetPriority
#define SDL_LogError
#define SDL_CreateSemaphore
#define SDL_Delay
#define SDL_WaitThread
#define SDL_Quit
#define SDL_Init
#define SDL_Log
#define SDL_snprintf
@ SDL_LOG_PRIORITY_INFO
Definition: SDL_log.h:106
@ SDL_LOG_CATEGORY_APPLICATION
Definition: SDL_log.h:66
GLuint const GLchar * name
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
#define NULL
Definition: begin_code.h:167
static SDL_Thread * threads[6]
Definition: testlock.c:25
static void killed(int sig)
Definition: testsem.c:45
#define NUM_THREADS
Definition: testsem.c:21
static SDL_sem * sem
Definition: testsem.c:23
int ThreadFunc(void *data)
Definition: testsem.c:27
static void TestWaitTimeout(void)
Definition: testsem.c:51

References alive, i, killed(), NULL, NUM_THREADS, SDL_CreateSemaphore, SDL_CreateThread, SDL_Delay, SDL_DestroySemaphore, SDL_GetError, SDL_Init, SDL_Log, SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO, SDL_LogError, SDL_LogSetPriority, SDL_Quit, SDL_snprintf, SDL_WaitThread, sem, TestWaitTimeout(), ThreadFunc(), and threads.

◆ TestWaitTimeout()

static void TestWaitTimeout ( void  )
static

Definition at line 51 of file testsem.c.

52{
53 Uint32 start_ticks;
54 Uint32 end_ticks;
55 Uint32 duration;
56 int retval;
57
59 SDL_Log("Waiting 2 seconds on semaphore\n");
60
61 start_ticks = SDL_GetTicks();
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 */
75 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL_SemWaitTimeout returned: %d; expected: %d\n", retval, SDL_MUTEX_TIMEDOUT);
76}
#define SDL_SemWaitTimeout
#define SDL_MUTEX_TIMEDOUT
Definition: SDL_mutex.h:44
uint32_t Uint32
Definition: SDL_stdinc.h:203
Uint32 SDL_GetTicks(void)
Get the number of milliseconds since the SDL library initialization.
SDL_bool retval

References retval, SDL_CreateSemaphore, SDL_GetTicks(), SDL_Log, SDL_LOG_CATEGORY_APPLICATION, SDL_LogError, SDL_MUTEX_TIMEDOUT, SDL_SemWaitTimeout, and sem.

Referenced by main().

◆ ThreadFunc()

int ThreadFunc ( void data)

Definition at line 27 of file testsem.c.

28{
29 int threadnum = (int) (uintptr_t) data;
30 while (alive) {
32 SDL_Log("Thread number %d has got the semaphore (value = %d)!\n",
33 threadnum, SDL_SemValue(sem));
34 SDL_Delay(200);
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}
#define SDL_SemValue
#define SDL_SemPost
#define SDL_SemWait
GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * data
Definition: SDL_opengl.h:1974

References alive, SDL_Delay, SDL_Log, SDL_SemPost, SDL_SemValue, SDL_SemWait, and sem.

Referenced by main().

Variable Documentation

◆ alive

int alive = 1

Definition at line 24 of file testsem.c.

Referenced by killed(), main(), and ThreadFunc().

◆ sem