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SDL_syssem.c (3921B)

      1 /*
      2   Simple DirectMedia Layer
      3   Copyright (C) 1997-2020 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 {
     56         SDL_OutOfMemory();
     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 {
    122     return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
    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  */