OW_ThreadTypes.hpp

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#ifndef OW_THREAD_TYPES_HPP_
#define OW_THREAD_TYPES_HPP_
#include "OW_config.h"

// The classes and functions defined in this file are not meant for general
// use, they are internal implementation details.  They may change at any time.

#if defined(OW_USE_PTHREAD)

   #include <pthread.h>

   namespace OW_NAMESPACE
   {

      // Platform specific thread type
      typedef pthread_t       Thread_t;
      typedef pthread_mutex_t NativeMutex_t;
      struct NonRecursiveMutex_t
      {
         pthread_mutex_t mutex;
      };

      #if defined(OW_HAVE_PTHREAD_MUTEXATTR_SETTYPE)
      // Platform specific mutex type
      // we have native recursive mutexes.
      struct Mutex_t
      {
         pthread_mutex_t mutex;
      };

      #else

      // we have to emulate recursive mutexes.
      struct Mutex_t
      {
         pthread_mutex_t mutex;
         pthread_cond_t unlocked;
         bool valid_id;
         unsigned count;
         pthread_t thread_id;
      };
      #endif

      // Platform specific conditional variable type
      typedef pthread_cond_t        ConditionVar_t;
      struct NonRecursiveMutexLockState
      {
         pthread_t thread_id;
         NativeMutex_t* pmutex;
      };

   } // end namespace OW_NAMESPACE

#elif defined(OW_WIN32)

   namespace OW_NAMESPACE
   {
      // Platform specific thread type
      typedef DWORD Thread_t;
      typedef HANDLE NativeMutex_t;
      typedef HANDLE NonRecursiveMutex_t;
      typedef LPCRITICAL_SECTION Mutex_t;

      // Platform specific conditional variable type
      typedef struct
      {
         // Number of waiting threads
         int waitersCount;
         // Serialize access to waitersCount
         CRITICAL_SECTION waitersCountLock;
         // Semaphore used to queue up threads waiting for the condition to
         // become signaled
            HANDLE queue;
         // An auto-reset event used during broadcasting to wait for all the 
         // threads to wake up and be released from the queue
         HANDLE waitersDone;
         // Keeps track of whether we are broadcasting or signaling. This allows
         // for optimization if just signaling.
         bool wasBroadcast;
      } ConditionInfo_t;

      typedef ConditionInfo_t* ConditionVar_t;
      //typedef void*         ConditionVar_t;
      struct NonRecursiveMutexLockState
      {
         DWORD thread_id;
         NativeMutex_t* pmutex;
      };

   } // end namespace OW_NAMESPACE

#endif

#endif   // #ifndef OW_THREAD_TYPES_HPP_
            

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