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