SDL  2.0
SDL_syssem.c
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
4 
5  This software is provided 'as-is', without any express or implied
6  warranty. In no event will the authors be held liable for any damages
7  arising from the use of this software.
8 
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12 
13  1. The origin of this software must not be misrepresented; you must not
14  claim that you wrote the original software. If you use this software
15  in a product, an acknowledgment in the product documentation would be
16  appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18  misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20 */
21 #include "../../SDL_internal.h"
22 
23 #if SDL_THREAD_PSP
24 
25 /* Semaphore functions for the PSP. */
26 
27 #include <stdio.h>
28 #include <stdlib.h>
29 
30 #include "SDL_error.h"
31 #include "SDL_thread.h"
32 
33 #include <pspthreadman.h>
34 #include <pspkerror.h>
35 
36 struct SDL_semaphore {
37  SceUID semid;
38 };
39 
40 
41 /* Create a semaphore */
42 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
43 {
44  SDL_sem *sem;
45 
46  sem = (SDL_sem *) malloc(sizeof(*sem));
47  if (sem != NULL) {
48  /* TODO: Figure out the limit on the maximum value. */
49  sem->semid = sceKernelCreateSema("SDL sema", 0, initial_value, 255, NULL);
50  if (sem->semid < 0) {
51  SDL_SetError("Couldn't create semaphore");
52  free(sem);
53  sem = NULL;
54  }
55  } else {
57  }
58 
59  return sem;
60 }
61 
62 /* Free the semaphore */
63 void SDL_DestroySemaphore(SDL_sem *sem)
64 {
65  if (sem != NULL) {
66  if (sem->semid > 0) {
67  sceKernelDeleteSema(sem->semid);
68  sem->semid = 0;
69  }
70 
71  free(sem);
72  }
73 }
74 
75 /* TODO: This routine is a bit overloaded.
76  * If the timeout is 0 then just poll the semaphore; if it's SDL_MUTEX_MAXWAIT, pass
77  * NULL to sceKernelWaitSema() so that it waits indefinitely; and if the timeout
78  * is specified, convert it to microseconds. */
79 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
80 {
81  Uint32 *pTimeout;
82  int res;
83 
84  if (sem == NULL) {
85  SDL_SetError("Passed a NULL sem");
86  return 0;
87  }
88 
89  if (timeout == 0) {
90  res = sceKernelPollSema(sem->semid, 1);
91  if (res < 0) {
92  return SDL_MUTEX_TIMEDOUT;
93  }
94  return 0;
95  }
96 
97  if (timeout == SDL_MUTEX_MAXWAIT) {
98  pTimeout = NULL;
99  } else {
100  timeout *= 1000; /* Convert to microseconds. */
101  pTimeout = &timeout;
102  }
103 
104  res = sceKernelWaitSema(sem->semid, 1, pTimeout);
105  switch (res) {
106  case SCE_KERNEL_ERROR_OK:
107  return 0;
108  case SCE_KERNEL_ERROR_WAIT_TIMEOUT:
109  return SDL_MUTEX_TIMEDOUT;
110  default:
111  return SDL_SetError("sceKernelWaitSema() failed");
112  }
113 }
114 
115 int SDL_SemTryWait(SDL_sem *sem)
116 {
117  return SDL_SemWaitTimeout(sem, 0);
118 }
119 
120 int SDL_SemWait(SDL_sem *sem)
121 {
123 }
124 
125 /* Returns the current count of the semaphore */
126 Uint32 SDL_SemValue(SDL_sem *sem)
127 {
128  SceKernelSemaInfo info;
129 
130  if (sem == NULL) {
131  SDL_SetError("Passed a NULL sem");
132  return 0;
133  }
134 
135  if (sceKernelReferSemaStatus(sem->semid, &info) >= 0) {
136  return info.currentCount;
137  }
138 
139  return 0;
140 }
141 
142 int SDL_SemPost(SDL_sem *sem)
143 {
144  int res;
145 
146  if (sem == NULL) {
147  return SDL_SetError("Passed a NULL sem");
148  }
149 
150  res = sceKernelSignalSema(sem->semid, 1);
151  if (res < 0) {
152  return SDL_SetError("sceKernelSignalSema() failed");
153  }
154 
155  return 0;
156 }
157 
158 #endif /* SDL_THREAD_PSP */
159 
160 /* vim: ts=4 sw=4
161  */
SDL_EventEntry * free
Definition: SDL_events.c:84
uint32_t Uint32
Definition: SDL_stdinc.h:181
int SDL_SemPost(SDL_sem *sem)
Definition: SDL_syssem.c:200
#define SDL_MUTEX_TIMEDOUT
Definition: SDL_mutex.h:44
GLuint res
#define SDL_MUTEX_MAXWAIT
Definition: SDL_mutex.h:49
int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
Definition: SDL_syssem.c:150
int SDL_SemTryWait(SDL_sem *sem)
Definition: SDL_syssem.c:130
int SDL_SemWait(SDL_sem *sem)
Definition: SDL_syssem.c:180
#define NULL
Definition: begin_code.h:164
#define SDL_OutOfMemory()
Definition: SDL_error.h:52
#define SDL_SetError
Uint32 SDL_SemValue(SDL_sem *sem)
Definition: SDL_syssem.c:186
GLbitfield GLuint64 timeout
#define malloc
Definition: SDL_qsort.c:47
void SDL_DestroySemaphore(SDL_sem *sem)
Definition: SDL_syssem.c:111
SDL_sem * SDL_CreateSemaphore(Uint32 initial_value)
Definition: SDL_syssem.c:85