/* Threads.h -- multithreading library
2024-03-28 : Igor Pavlov : Public domain */

#ifndef ZIP7_INC_THREADS_H
#define ZIP7_INC_THREADS_H

#ifdef _WIN32
#include "7zWindows.h"

#else

#include "Compiler.h"

// #define Z7_AFFINITY_DISABLE
#if defined(__linux__)
#if !defined(__APPLE__) && !defined(_AIX) && !defined(__ANDROID__)
#ifndef Z7_AFFINITY_DISABLE
#define Z7_AFFINITY_SUPPORTED
// #pragma message(" ==== Z7_AFFINITY_SUPPORTED")
#if !defined(_GNU_SOURCE)
// #pragma message(" ==== _GNU_SOURCE set")
// we need _GNU_SOURCE for cpu_set_t, if we compile for MUSL
Z7_DIAGNOSTIC_IGNORE_BEGIN_RESERVED_MACRO_IDENTIFIER
#define _GNU_SOURCE
Z7_DIAGNOSTIC_IGNORE_END_RESERVED_MACRO_IDENTIFIER
#endif
#endif
#endif
#endif

#include <pthread.h>
#include <sched.h>

#endif

#include "7zTypes.h"
#include <WinCompat.h>

EXTERN_C_BEGIN

#ifdef _WIN32

WRes HandlePtr_Close(HANDLE *h);
WRes Handle_WaitObject(HANDLE h);

typedef HANDLE CThread;

#define Thread_CONSTRUCT(p) { *(p) = NULL; }
#define Thread_WasCreated(p) (*(p) != NULL)
#define Thread_Close(p) HandlePtr_Close(p)
// #define Thread_Wait(p) Handle_WaitObject(*(p))

#ifdef UNDER_CE
  // if (USE_THREADS_CreateThread is      defined), we use _beginthreadex()
  // if (USE_THREADS_CreateThread is not definned), we use CreateThread()
  #define USE_THREADS_CreateThread
#endif

typedef
    #ifdef USE_THREADS_CreateThread
      DWORD
    #else
      unsigned
    #endif
    THREAD_FUNC_RET_TYPE;

#define THREAD_FUNC_RET_ZERO  0

typedef DWORD_PTR CAffinityMask;
typedef DWORD_PTR CCpuSet;

#define CpuSet_Zero(p)        *(p) = (0)
#define CpuSet_Set(p, cpu)    *(p) |= ((DWORD_PTR)1 << (cpu))

#else //  _WIN32

typedef struct
{
  pthread_t _tid;
  int _created;
} CThread;

#define Thread_CONSTRUCT(p)   { (p)->_tid = 0;  (p)->_created = 0; }
#define Thread_WasCreated(p)  ((p)->_created != 0)
WRes Thread_Close(CThread *p);
// #define Thread_Wait Thread_Wait_Close

typedef void * THREAD_FUNC_RET_TYPE;
#define THREAD_FUNC_RET_ZERO  NULL


typedef UInt64 CAffinityMask;

#ifdef Z7_AFFINITY_SUPPORTED

typedef cpu_set_t CCpuSet;
#define CpuSet_Zero(p)        CPU_ZERO(p)
#define CpuSet_Set(p, cpu)    CPU_SET(cpu, p)
#define CpuSet_IsSet(p, cpu)  CPU_ISSET(cpu, p)

#else

typedef UInt64 CCpuSet;
#define CpuSet_Zero(p)        *(p) = (0)
#define CpuSet_Set(p, cpu)    *(p) |= ((UInt64)1 << (cpu))
#define CpuSet_IsSet(p, cpu)  ((*(p) & ((UInt64)1 << (cpu))) != 0)

#endif


#endif //  _WIN32


#define THREAD_FUNC_CALL_TYPE Z7_STDCALL

#if defined(_WIN32) && defined(__GNUC__)
/* GCC compiler for x86 32-bit uses the rule:
   the stack is 16-byte aligned before CALL instruction for function calling.
   But only root function main() contains instructions that
   set 16-byte alignment for stack pointer. And another functions
   just keep alignment, if it was set in some parent function.
   
   The problem:
    if we create new thread in MinGW (GCC) 32-bit x86 via _beginthreadex() or CreateThread(),
       the root function of thread doesn't set 16-byte alignment.
       And stack frames in all child functions also will be unaligned in that case.
   
   Here we set (force_align_arg_pointer) attribute for root function of new thread.
   Do we need (force_align_arg_pointer) also for another systems?  */
  
  #define THREAD_FUNC_ATTRIB_ALIGN_ARG __attribute__((force_align_arg_pointer))
  // #define THREAD_FUNC_ATTRIB_ALIGN_ARG // for debug : bad alignment in SSE functions
#else
  #define THREAD_FUNC_ATTRIB_ALIGN_ARG
#endif

#define THREAD_FUNC_DECL  THREAD_FUNC_ATTRIB_ALIGN_ARG THREAD_FUNC_RET_TYPE THREAD_FUNC_CALL_TYPE

typedef THREAD_FUNC_RET_TYPE (THREAD_FUNC_CALL_TYPE * THREAD_FUNC_TYPE)(void *);
WRes Thread_Create(CThread *p, THREAD_FUNC_TYPE func, LPVOID param);
WRes Thread_Create_With_Affinity(CThread *p, THREAD_FUNC_TYPE func, LPVOID param, CAffinityMask affinity);
WRes Thread_Wait_Close(CThread *p);

#ifdef _WIN32
#define Thread_Create_With_CpuSet(p, func, param, cs) \
  Thread_Create_With_Affinity(p, func, param, *cs)
#else
WRes Thread_Create_With_CpuSet(CThread *p, THREAD_FUNC_TYPE func, LPVOID param, const CCpuSet *cpuSet);
#endif


#ifdef _WIN32

typedef HANDLE CEvent;
typedef CEvent CAutoResetEvent;
typedef CEvent CManualResetEvent;
#define Event_Construct(p) *(p) = NULL
#define Event_IsCreated(p) (*(p) != NULL)
#define Event_Close(p) HandlePtr_Close(p)
#define Event_Wait(p) Handle_WaitObject(*(p))
WRes Event_Set(CEvent *p);
WRes Event_Reset(CEvent *p);
WRes ManualResetEvent_Create(CManualResetEvent *p, int signaled);
WRes ManualResetEvent_CreateNotSignaled(CManualResetEvent *p);
WRes AutoResetEvent_Create(CAutoResetEvent *p, int signaled);
WRes AutoResetEvent_CreateNotSignaled(CAutoResetEvent *p);

typedef HANDLE CSemaphore;
#define Semaphore_Construct(p) *(p) = NULL
#define Semaphore_IsCreated(p) (*(p) != NULL)
#define Semaphore_Close(p) HandlePtr_Close(p)
#define Semaphore_Wait(p) Handle_WaitObject(*(p))
WRes Semaphore_Create(CSemaphore *p, UInt32 initCount, UInt32 maxCount);
WRes Semaphore_OptCreateInit(CSemaphore *p, UInt32 initCount, UInt32 maxCount);
WRes Semaphore_ReleaseN(CSemaphore *p, UInt32 num);
WRes Semaphore_Release1(CSemaphore *p);

typedef CRITICAL_SECTION CCriticalSection;
WRes CriticalSection_Init(CCriticalSection *p);
#define CriticalSection_Delete(p) DeleteCriticalSection(p)
#define CriticalSection_Enter(p) EnterCriticalSection(p)
#define CriticalSection_Leave(p) LeaveCriticalSection(p)


#else // _WIN32

typedef struct
{
  int _created;
  int _manual_reset;
  int _state;
  pthread_mutex_t _mutex;
  pthread_cond_t _cond;
} CEvent;

typedef CEvent CAutoResetEvent;
typedef CEvent CManualResetEvent;

#define Event_Construct(p) (p)->_created = 0
#define Event_IsCreated(p) ((p)->_created)

WRes ManualResetEvent_Create(CManualResetEvent *p, int signaled);
WRes ManualResetEvent_CreateNotSignaled(CManualResetEvent *p);
WRes AutoResetEvent_Create(CAutoResetEvent *p, int signaled);
WRes AutoResetEvent_CreateNotSignaled(CAutoResetEvent *p);

WRes Event_Set(CEvent *p);
WRes Event_Reset(CEvent *p);
WRes Event_Wait(CEvent *p);
WRes Event_Close(CEvent *p);


typedef struct
{
  int _created;
  UInt32 _count;
  UInt32 _maxCount;
  pthread_mutex_t _mutex;
  pthread_cond_t _cond;
} CSemaphore;

#define Semaphore_Construct(p) (p)->_created = 0
#define Semaphore_IsCreated(p) ((p)->_created)

WRes Semaphore_Create(CSemaphore *p, UInt32 initCount, UInt32 maxCount);
WRes Semaphore_OptCreateInit(CSemaphore *p, UInt32 initCount, UInt32 maxCount);
WRes Semaphore_ReleaseN(CSemaphore *p, UInt32 num);
#define Semaphore_Release1(p) Semaphore_ReleaseN(p, 1)
WRes Semaphore_Wait(CSemaphore *p);
WRes Semaphore_Close(CSemaphore *p);


typedef struct
{
  pthread_mutex_t _mutex;
} CCriticalSection;

WRes CriticalSection_Init(CCriticalSection *p);
void CriticalSection_Delete(CCriticalSection *cs);
void CriticalSection_Enter(CCriticalSection *cs);
void CriticalSection_Leave(CCriticalSection *cs);

LONG InterlockedIncrement(LONG volatile *addend);
LONG InterlockedDecrement(LONG volatile *addend);

#endif  // _WIN32

WRes AutoResetEvent_OptCreate_And_Reset(CAutoResetEvent *p);

EXTERN_C_END

#endif
