| 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 | |