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
  22 #define NORETURN        __attribute__((noreturn))
  23 #include <logdebug.h>   // Kernel land, but uses standards
  24 #include <errno.h>
  25
  26 // === CODE ===
  27 void Threads_Glue_Yield(void)
  28 {
  29         SDL_Delay(10);
  30 }
  31
  32 void Threads_Glue_AcquireMutex(void **Lock)
  33 {
  34         if(!*Lock) {
  35                 *Lock = malloc( sizeof(pthread_mutex_t) );
  36                 pthread_mutex_init( *Lock, NULL );
  37         }
  38         pthread_mutex_lock( *Lock );
  39 }
  40
  41 void Threads_Glue_ReleaseMutex(void **Lock)
  42 {
  43         pthread_mutex_unlock( *Lock );
  44 }
  45
  46 void Threads_Glue_SemInit(void **Ptr, int Val)
  47 {
  48         *Ptr = SDL_CreateSemaphore(Val);
  49         if( !*Ptr ) {
  50                 Log_Warning("Threads", "Semaphore creation failed - %s", SDL_GetError());
  51         }
  52 }
  53
  54 int Threads_Glue_SemWait(void *Ptr, int Max)
  55 {
  56          int    have = 0;
  57         assert(Ptr);
  58         do {
  59                 if( SDL_SemWait( Ptr ) == -1 ) {
  60                         return -1;
  61                 }
  62                 have ++;
  63         } while( SDL_SemValue(Ptr) && have < Max );
  64         return have;
  65 }
  66
  67 int Threads_Glue_SemSignal( void *Ptr, int AmmountToAdd )
  68 {
  69         for( int i = 0; i < AmmountToAdd; i ++ )
  70                 SDL_SemPost( Ptr );
  71         return AmmountToAdd;
  72 }
  73
  74 void Threads_Glue_SemDestroy( void *Ptr )
  75 {
  76         SDL_DestroySemaphore(Ptr);
  77 }
  78
  79 // ---
  80 // Short Locks
  81 // ---
  82 void Threads_int_ShortLock(void **MutexPtr)
  83 {
  84         if( !*MutexPtr ) {
  85                 *MutexPtr = malloc( sizeof(pthread_mutex_t) );
  86                 pthread_mutexattr_t     attr;
  87                 pthread_mutexattr_init(&attr);
  88                 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK);
  89                 pthread_mutex_init(*MutexPtr, NULL);
  90         }
  91         if( pthread_mutex_lock(*MutexPtr) ) {
  92                 fprintf(stderr, "ERROR: Mutex pointer %p double locked\n", MutexPtr);
  93                 AcessNative_Exit();
  94         }
  95 }
  96
  97 void Threads_int_ShortRel(void **MutexPtr)
  98 {
  99         pthread_mutex_unlock(*MutexPtr);
 100 }
 101
 102 int Threads_int_ShortHas(void **Ptr)
 103 {
 104         if( !*Ptr )
 105                 return 0;
 106         int rv = pthread_mutex_trylock(*Ptr);
 107         if( rv == 0 ) {
 108                 pthread_mutex_unlock(*Ptr);
 109                 return 0;
 110         }
 111         if( rv == EBUSY ) {
 112                 return 0;
 113         }
 114         return 1;
 115 }
 116