| 1 | #ifndef _WIN32THREAD_H
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| 2 | #define _WIN32THREAD_H
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| 3 |
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| 4 | #include "win32.h"
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| 5 |
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| 6 | typedef struct win32_cond { LONG waiters; HANDLE sem; } perl_cond;
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| 7 | typedef DWORD perl_key;
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| 8 | typedef HANDLE perl_os_thread;
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| 9 |
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| 10 | #ifndef DONT_USE_CRITICAL_SECTION
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| 11 |
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| 12 | /* Critical Sections used instead of mutexes: lightweight,
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| 13 | * but can't be communicated to child processes, and can't get
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| 14 | * HANDLE to it for use elsewhere.
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| 15 | */
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| 16 | typedef CRITICAL_SECTION perl_mutex;
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| 17 | #define MUTEX_INIT(m) InitializeCriticalSection(m)
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| 18 | #define MUTEX_LOCK(m) EnterCriticalSection(m)
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| 19 | #define MUTEX_UNLOCK(m) LeaveCriticalSection(m)
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| 20 | #define MUTEX_DESTROY(m) DeleteCriticalSection(m)
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| 21 |
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| 22 | #else
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| 23 |
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| 24 | typedef HANDLE perl_mutex;
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| 25 | # define MUTEX_INIT(m) \
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| 26 | STMT_START { \
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| 27 | if ((*(m) = CreateMutex(NULL,FALSE,NULL)) == NULL) \
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| 28 | Perl_croak_nocontext("panic: MUTEX_INIT"); \
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| 29 | } STMT_END
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| 30 |
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| 31 | # define MUTEX_LOCK(m) \
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| 32 | STMT_START { \
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| 33 | if (WaitForSingleObject(*(m),INFINITE) == WAIT_FAILED) \
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| 34 | Perl_croak_nocontext("panic: MUTEX_LOCK"); \
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| 35 | } STMT_END
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| 36 |
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| 37 | # define MUTEX_UNLOCK(m) \
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| 38 | STMT_START { \
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| 39 | if (ReleaseMutex(*(m)) == 0) \
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| 40 | Perl_croak_nocontext("panic: MUTEX_UNLOCK"); \
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| 41 | } STMT_END
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| 42 |
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| 43 | # define MUTEX_DESTROY(m) \
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| 44 | STMT_START { \
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| 45 | if (CloseHandle(*(m)) == 0) \
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| 46 | Perl_croak_nocontext("panic: MUTEX_DESTROY"); \
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| 47 | } STMT_END
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| 48 |
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| 49 | #endif
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| 50 |
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| 51 | /* These macros assume that the mutex associated with the condition
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| 52 | * will always be held before COND_{SIGNAL,BROADCAST,WAIT,DESTROY},
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| 53 | * so there's no separate mutex protecting access to (c)->waiters
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| 54 | */
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| 55 | #define COND_INIT(c) \
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| 56 | STMT_START { \
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| 57 | (c)->waiters = 0; \
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| 58 | (c)->sem = CreateSemaphore(NULL,0,LONG_MAX,NULL); \
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| 59 | if ((c)->sem == NULL) \
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| 60 | Perl_croak_nocontext("panic: COND_INIT (%ld)",GetLastError()); \
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| 61 | } STMT_END
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| 62 |
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| 63 | #define COND_SIGNAL(c) \
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| 64 | STMT_START { \
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| 65 | if ((c)->waiters > 0 && \
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| 66 | ReleaseSemaphore((c)->sem,1,NULL) == 0) \
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| 67 | Perl_croak_nocontext("panic: COND_SIGNAL (%ld)",GetLastError()); \
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| 68 | } STMT_END
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| 69 |
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| 70 | #define COND_BROADCAST(c) \
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| 71 | STMT_START { \
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| 72 | if ((c)->waiters > 0 && \
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| 73 | ReleaseSemaphore((c)->sem,(c)->waiters,NULL) == 0) \
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| 74 | Perl_croak_nocontext("panic: COND_BROADCAST (%ld)",GetLastError());\
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| 75 | } STMT_END
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| 76 |
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| 77 | #define COND_WAIT(c, m) \
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| 78 | STMT_START { \
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| 79 | (c)->waiters++; \
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| 80 | MUTEX_UNLOCK(m); \
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| 81 | /* Note that there's no race here, since a \
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| 82 | * COND_BROADCAST() on another thread will have seen the\
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| 83 | * right number of waiters (i.e. including this one) */ \
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| 84 | if (WaitForSingleObject((c)->sem,INFINITE)==WAIT_FAILED)\
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| 85 | Perl_croak_nocontext("panic: COND_WAIT (%ld)",GetLastError()); \
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| 86 | /* XXX there may be an inconsequential race here */ \
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| 87 | MUTEX_LOCK(m); \
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| 88 | (c)->waiters--; \
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| 89 | } STMT_END
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| 90 |
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| 91 | #define COND_DESTROY(c) \
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| 92 | STMT_START { \
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| 93 | (c)->waiters = 0; \
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| 94 | if (CloseHandle((c)->sem) == 0) \
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| 95 | Perl_croak_nocontext("panic: COND_DESTROY (%ld)",GetLastError()); \
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| 96 | } STMT_END
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| 97 |
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| 98 | #define DETACH(t) \
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| 99 | STMT_START { \
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| 100 | if (CloseHandle((t)->self) == 0) { \
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| 101 | MUTEX_UNLOCK(&(t)->mutex); \
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| 102 | Perl_croak_nocontext("panic: DETACH"); \
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| 103 | } \
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| 104 | } STMT_END
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| 105 |
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| 106 |
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| 107 | #define THREAD_CREATE(t, f) Perl_thread_create(t, f)
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| 108 | #define THREAD_POST_CREATE(t) NOOP
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| 109 |
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| 110 | /* XXX Docs mention that the RTL versions of thread creation routines
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| 111 | * should be used, but that advice only seems applicable when the RTL
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| 112 | * is not in a DLL. RTL DLLs in both Borland and VC seem to do all of
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| 113 | * the init/deinit required upon DLL_THREAD_ATTACH/DETACH. So we seem
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| 114 | * to be completely safe using straight Win32 API calls, rather than
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| 115 | * the much braindamaged RTL calls.
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| 116 | *
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| 117 | * _beginthread() in the RTLs call CloseHandle() just after the thread
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| 118 | * function returns, which means: 1) we have a race on our hands
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| 119 | * 2) it is impossible to implement join() semantics.
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| 120 | *
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| 121 | * IOW, do *NOT* turn on USE_RTL_THREAD_API! It is here
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| 122 | * for experimental purposes only. GSAR 98-01-02
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| 123 | */
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| 124 | #ifdef USE_RTL_THREAD_API
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| 125 | # include <process.h>
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| 126 | # if defined(__BORLANDC__)
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| 127 | /* Borland RTL doesn't allow a return value from thread function! */
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| 128 | # define THREAD_RET_TYPE void _USERENTRY
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| 129 | # define THREAD_RET_CAST(p) ((void)(thr->i.retv = (void *)(p)))
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| 130 | # elif defined (_MSC_VER)
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| 131 | # define THREAD_RET_TYPE unsigned __stdcall
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| 132 | # define THREAD_RET_CAST(p) ((unsigned)(p))
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| 133 | # else
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| 134 | /* CRTDLL.DLL doesn't allow a return value from thread function! */
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| 135 | # define THREAD_RET_TYPE void __cdecl
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| 136 | # define THREAD_RET_CAST(p) ((void)(thr->i.retv = (void *)(p)))
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| 137 | # endif
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| 138 | #else /* !USE_RTL_THREAD_API */
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| 139 | # define THREAD_RET_TYPE DWORD WINAPI
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| 140 | # define THREAD_RET_CAST(p) ((DWORD)(p))
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| 141 | #endif /* !USE_RTL_THREAD_API */
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| 142 |
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| 143 | typedef THREAD_RET_TYPE thread_func_t(void *);
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| 144 |
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| 145 |
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| 146 | START_EXTERN_C
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| 147 |
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| 148 | #if defined(PERLDLL) && defined(USE_DECLSPEC_THREAD) && (!defined(__BORLANDC__) || defined(_DLL))
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| 149 | extern __declspec(thread) void *PL_current_context;
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| 150 | #define PERL_SET_CONTEXT(t) (PL_current_context = t)
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| 151 | #define PERL_GET_CONTEXT PL_current_context
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| 152 | #else
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| 153 | #define PERL_GET_CONTEXT Perl_get_context()
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| 154 | #define PERL_SET_CONTEXT(t) Perl_set_context(t)
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| 155 | #endif
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| 156 |
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| 157 | #if defined(USE_5005THREADS)
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| 158 | struct perl_thread;
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| 159 | int Perl_thread_create (struct perl_thread *thr, thread_func_t *fn);
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| 160 | void Perl_set_thread_self (struct perl_thread *thr);
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| 161 | void Perl_init_thread_intern (struct perl_thread *t);
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| 162 |
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| 163 | #define SET_THREAD_SELF(thr) Perl_set_thread_self(thr)
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| 164 |
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| 165 | #endif /* USE_5005THREADS */
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| 166 |
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| 167 | END_EXTERN_C
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| 168 |
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| 169 | #define INIT_THREADS NOOP
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| 170 | #define ALLOC_THREAD_KEY \
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| 171 | STMT_START { \
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| 172 | if ((PL_thr_key = TlsAlloc()) == TLS_OUT_OF_INDEXES) { \
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| 173 | PerlIO_printf(PerlIO_stderr(),"panic: TlsAlloc"); \
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| 174 | exit(1); \
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| 175 | } \
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| 176 | } STMT_END
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| 177 |
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| 178 | #define FREE_THREAD_KEY \
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| 179 | STMT_START { \
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| 180 | TlsFree(PL_thr_key); \
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| 181 | } STMT_END
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| 182 |
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| 183 | #define PTHREAD_ATFORK(prepare,parent,child) NOOP
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| 184 |
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| 185 | #if defined(USE_RTL_THREAD_API) && !defined(_MSC_VER)
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| 186 | #define JOIN(t, avp) \
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| 187 | STMT_START { \
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| 188 | if ((WaitForSingleObject((t)->self,INFINITE) == WAIT_FAILED) \
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| 189 | || (GetExitCodeThread((t)->self,(LPDWORD)(avp)) == 0) \
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| 190 | || (CloseHandle((t)->self) == 0)) \
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| 191 | Perl_croak_nocontext("panic: JOIN"); \
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| 192 | *avp = (AV *)((t)->i.retv); \
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| 193 | } STMT_END
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| 194 | #else /* !USE_RTL_THREAD_API || _MSC_VER */
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| 195 | #define JOIN(t, avp) \
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| 196 | STMT_START { \
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| 197 | if ((WaitForSingleObject((t)->self,INFINITE) == WAIT_FAILED) \
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| 198 | || (GetExitCodeThread((t)->self,(LPDWORD)(avp)) == 0) \
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| 199 | || (CloseHandle((t)->self) == 0)) \
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| 200 | Perl_croak_nocontext("panic: JOIN"); \
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| 201 | } STMT_END
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| 202 | #endif /* !USE_RTL_THREAD_API || _MSC_VER */
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| 203 |
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| 204 | #define YIELD Sleep(0)
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| 205 |
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| 206 | #endif /* _WIN32THREAD_H */
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| 207 |
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