AcessNative/acesskernel_src/threads_glue.c

   1 /*
   2  * Acess2 Native Kernel
   3  * - Acess kernel emulation on another OS using SDL and UDP
   4  *
   5  * threads.c
   6  * - Thread and process handling
   7  */
   8 #include "include/threads_glue.h"
   9
  10 #define _ACESS_H
  11 typedef void    **tShortSpinlock;
  12 #include <rwlock.h>
  13
  14 // - Native headers
  15 #include <unistd.h>
  16 #include <sys/types.h>
  17 #include <stdint.h>
  18 //#include "/usr/include/signal.h"
  19 #include <SDL/SDL.h>
  20 #include <pthread.h>
  21 #include <assert.h>
  22
  23 #include <logdebug.h>   // Kernel land, but uses standards
  24
  25 // === CODE ===
  26 void Threads_Glue_Yield(void)
  27 {
  28         SDL_Delay(10);
  29 }
  30
  31 void Threads_Glue_AcquireMutex(void **Lock)
  32 {
  33         if(!*Lock) {
  34                 *Lock = malloc( sizeof(pthread_mutex_t) );
  35                 pthread_mutex_init( *Lock, NULL );
  36         }
  37         pthread_mutex_lock( *Lock );
  38 }
  39
  40 void Threads_Glue_ReleaseMutex(void **Lock)
  41 {
  42         pthread_mutex_unlock( *Lock );
  43 }
  44
  45 void Threads_Glue_SemInit(void **Ptr, int Val)
  46 {
  47         *Ptr = SDL_CreateSemaphore(Val);
  48         if( !*Ptr ) {
  49                 Log_Warning("Threads", "Semaphore creation failed - %s", SDL_GetError());
  50         }
  51 }
  52
  53 int Threads_Glue_SemWait(void *Ptr, int Max)
  54 {
  55          int    have = 0;
  56         assert(Ptr);
  57         do {
  58                 if( SDL_SemWait( Ptr ) == -1 ) {
  59                         return -1;
  60                 }
  61                 have ++;
  62         } while( SDL_SemValue(Ptr) && have < Max );
  63         return have;
  64 }
  65
  66 int Threads_Glue_SemSignal( void *Ptr, int AmmountToAdd )
  67 {
  68          int    i;
  69         for( i = 0; i < AmmountToAdd; i ++ )
  70                 SDL_SemPost( Ptr );
  71         return AmmountToAdd;
  72 }
  73
  74 // --------------------------------------------------------------------
  75 // Event handling
  76 // --------------------------------------------------------------------
  77 int RWLock_AcquireRead(tRWLock *Lock)
  78 {
  79         if( !Lock->ReaderWaiting ) {
  80                 Lock->ReaderWaiting = malloc(sizeof(pthread_rwlock_t));
  81                 pthread_rwlock_init( (void*)Lock->ReaderWaiting, 0 );
  82         }
  83         pthread_rwlock_rdlock( (void*)Lock->ReaderWaiting );
  84         return 0;
  85 }
  86 int RWLock_AcquireWrite(tRWLock *Lock)
  87 {
  88         if( !Lock->ReaderWaiting ) {
  89                 Lock->ReaderWaiting = malloc(sizeof(pthread_rwlock_t));
  90                 pthread_rwlock_init( (void*)Lock->ReaderWaiting, 0 );
  91         }
  92         pthread_rwlock_wrlock( (void*)Lock->ReaderWaiting );
  93         return 0;
  94 }
  95 void RWLock_Release(tRWLock *Lock)
  96 {
  97         pthread_rwlock_unlock( (void*)Lock->ReaderWaiting );
  98 }
  99