#ifndef _WIN32THREAD_H
#define _WIN32THREAD_H
#include "win32.h"
typedef struct win32_cond { LONG waiters; HANDLE sem; } perl_cond;
typedef DWORD perl_key;
typedef HANDLE perl_os_thread;
#ifndef DONT_USE_CRITICAL_SECTION
/* Critical Sections used instead of mutexes: lightweight,
 * but can't be communicated to child processes, and can't get
 * HANDLE to it for use elsewhere.
 */
typedef CRITICAL_SECTION perl_mutex;
#define MUTEX_INIT(m) InitializeCriticalSection(m)
#define MUTEX_LOCK(m) EnterCriticalSection(m)
#define MUTEX_UNLOCK(m) LeaveCriticalSection(m)
#define MUTEX_DESTROY(m) DeleteCriticalSection(m)
#else
typedef HANDLE perl_mutex;
#  define MUTEX_INIT(m) \
    STMT_START {                                                \
        if ((*(m) = CreateMutex(NULL,FALSE,NULL)) == NULL)      \
            Perl_croak_nocontext("panic: MUTEX_INIT");          \
    } STMT_END
#  define MUTEX_LOCK(m) \
    STMT_START {                                                \
        if (WaitForSingleObject(*(m),INFINITE) == WAIT_FAILED)  \
            Perl_croak_nocontext("panic: MUTEX_LOCK");          \
    } STMT_END
#  define MUTEX_UNLOCK(m) \
    STMT_START {                                                \
        if (ReleaseMutex(*(m)) == 0)                            \
            Perl_croak_nocontext("panic: MUTEX_UNLOCK");        \
    } STMT_END
#  define MUTEX_DESTROY(m) \
    STMT_START {                                                \
        if (CloseHandle(*(m)) == 0)                             \
            Perl_croak_nocontext("panic: MUTEX_DESTROY");       \
    } STMT_END
#endif
/* These macros assume that the mutex associated with the condition
 * will always be held before COND_{SIGNAL,BROADCAST,WAIT,DESTROY},
 * so there's no separate mutex protecting access to (c)->waiters
 */
#define COND_INIT(c) \
    STMT_START {                                                \
        (c)->waiters = 0;                                    \
        (c)->sem = Win_CreateSemaphore(NULL,0,LONG_MAX,NULL);        \
        if ((c)->sem == NULL)                                        \
            Perl_croak_nocontext("panic: COND_INIT (%ld)",GetLastError());      \
    } STMT_END
#define COND_SIGNAL(c) \
    STMT_START {                                                \
        if ((c)->waiters > 0 &&                                   \
            ReleaseSemaphore((c)->sem,1,NULL) == 0)          \
            Perl_croak_nocontext("panic: COND_SIGNAL (%ld)",GetLastError());    \
    } STMT_END
#define COND_BROADCAST(c) \
    STMT_START {                                                \
        if ((c)->waiters > 0 &&                                   \
            ReleaseSemaphore((c)->sem,(c)->waiters,NULL) == 0)    \
            Perl_croak_nocontext("panic: COND_BROADCAST (%ld)",GetLastError());\
    } STMT_END
#define COND_WAIT(c, m) \
    STMT_START {                                                \
        (c)->waiters++;                                              \
        MUTEX_UNLOCK(m);                                        \
        /* Note that there's no race here, since a              \
         * COND_BROADCAST() on another thread will have seen the\
         * right number of waiters (i.e. including this one) */ \
        if (WaitForSingleObject((c)->sem,INFINITE)==WAIT_FAILED)\
            Perl_croak_nocontext("panic: COND_WAIT (%ld)",GetLastError());      \
        /* XXX there may be an inconsequential race here */     \
        MUTEX_LOCK(m);                                          \
        (c)->waiters--;                                              \
    } STMT_END
#define COND_DESTROY(c) \
    STMT_START {                                                \
        (c)->waiters = 0;                                    \
        if (CloseHandle((c)->sem) == 0)                              \
            Perl_croak_nocontext("panic: COND_DESTROY (%ld)",GetLastError());   \
    } STMT_END
#define DETACH(t) \
    STMT_START {                                                \
        if (CloseHandle((t)->self) == 0) {                   \
            MUTEX_UNLOCK(&(t)->mutex);                           \
            Perl_croak_nocontext("panic: DETACH");              \
        }                                                       \
    } STMT_END
/* XXX Docs mention that the RTL versions of thread creation routines
 * should be used, but that advice only seems applicable when the RTL
 * is not in a DLL.  RTL DLLs seem to do all of the init/deinit required
 * upon DLL_THREAD_ATTACH/DETACH.  So we seem to be completely safe using
 * straight Win32 API calls, rather than the much braindamaged RTL calls.
 *
 * _beginthread() in the RTLs call CloseHandle() just after the thread
 * function returns, which means: 1) we have a race on our hands
 * 2) it is impossible to implement join() semantics.
 *
 * IOW, do *NOT* turn on USE_RTL_THREAD_API!  It is here
 * for experimental purposes only. GSAR 98-01-02
 */
#ifdef USE_RTL_THREAD_API
#  include <process.h>
#  if defined (_MSC_VER)
#    define THREAD_RET_TYPE     unsigned __stdcall
#  else
     /* CRTDLL.DLL doesn't allow a return value from thread function! */
#    define THREAD_RET_TYPE     void __cdecl
#  endif
#else   /* !USE_RTL_THREAD_API */
#  define THREAD_RET_TYPE       DWORD WINAPI
#endif  /* !USE_RTL_THREAD_API */
typedef THREAD_RET_TYPE thread_func_t(void *);
START_EXTERN_C
#if defined(PERLDLL) && defined(USE_DECLSPEC_THREAD)
extern __declspec(thread) void *PL_current_context;
#define PERL_SET_CONTEXT(t)             (PL_current_context = t)
#define PERL_GET_CONTEXT                PL_current_context
#else
#define PERL_GET_CONTEXT                Perl_get_context()
#define PERL_SET_CONTEXT(t)             Perl_set_context(t)
#endif
END_EXTERN_C
#define INIT_THREADS            NOOP
#define ALLOC_THREAD_KEY \
    STMT_START {                                                        \
        if ((PL_thr_key = TlsAlloc()) == TLS_OUT_OF_INDEXES) {          \
            PerlIO_printf(PerlIO_stderr(),"panic: TlsAlloc");                           \
            exit(1);                                                    \
        }                                                               \
    } STMT_END
#define FREE_THREAD_KEY \
    STMT_START {                                                        \
        TlsFree(PL_thr_key);                                            \
    } STMT_END
#define PTHREAD_ATFORK(prepare,parent,child)    NOOP
#if defined(USE_RTL_THREAD_API) && !defined(_MSC_VER)
#define JOIN(t, avp)                                                    \
    STMT_START {                                                        \
        if ((WaitForSingleObject((t)->self,INFINITE) == WAIT_FAILED) \
             || (GetExitCodeThread((t)->self,(LPDWORD)(avp)) == 0)   \
             || (CloseHandle((t)->self) == 0))                               \
            Perl_croak_nocontext("panic: JOIN");                        \
        *avp = (AV *)((t)->i.retv);                                  \
    } STMT_END
#else   /* !USE_RTL_THREAD_API || _MSC_VER */
#define JOIN(t, avp)                                                    \
    STMT_START {                                                        \
        if ((WaitForSingleObject((t)->self,INFINITE) == WAIT_FAILED) \
             || (GetExitCodeThread((t)->self,(LPDWORD)(avp)) == 0)   \
             || (CloseHandle((t)->self) == 0))                               \
            Perl_croak_nocontext("panic: JOIN");                        \
    } STMT_END
#endif  /* !USE_RTL_THREAD_API || _MSC_VER */
#define YIELD                   Sleep(0)
#endif /* _WIN32THREAD_H */