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e1caacb4 JH |
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; \ | |
216db7ee | 58 | (c)->sem = CreateSemaphoreW(NULL,0,LONG_MAX,NULL); \ |
e1caacb4 JH |
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 in both Borland and VC seem to do all of | |
113 | * the init/deinit required upon DLL_THREAD_ATTACH/DETACH. So we seem | |
114 | * to be completely safe using straight Win32 API calls, rather than | |
115 | * the much braindamaged RTL calls. | |
116 | * | |
117 | * _beginthread() in the RTLs call CloseHandle() just after the thread | |
118 | * function returns, which means: 1) we have a race on our hands | |
119 | * 2) it is impossible to implement join() semantics. | |
120 | * | |
121 | * IOW, do *NOT* turn on USE_RTL_THREAD_API! It is here | |
122 | * for experimental purposes only. GSAR 98-01-02 | |
123 | */ | |
124 | #ifdef USE_RTL_THREAD_API | |
125 | # include <process.h> | |
126 | # if defined(__BORLANDC__) | |
127 | /* Borland RTL doesn't allow a return value from thread function! */ | |
128 | # define THREAD_RET_TYPE void _USERENTRY | |
129 | # define THREAD_RET_CAST(p) ((void)(thr->i.retv = (void *)(p))) | |
130 | # elif defined (_MSC_VER) | |
131 | # define THREAD_RET_TYPE unsigned __stdcall | |
132 | # define THREAD_RET_CAST(p) ((unsigned)(p)) | |
133 | # else | |
134 | /* CRTDLL.DLL doesn't allow a return value from thread function! */ | |
135 | # define THREAD_RET_TYPE void __cdecl | |
136 | # define THREAD_RET_CAST(p) ((void)(thr->i.retv = (void *)(p))) | |
137 | # endif | |
138 | #else /* !USE_RTL_THREAD_API */ | |
139 | # define THREAD_RET_TYPE DWORD WINAPI | |
140 | # define THREAD_RET_CAST(p) ((DWORD)(p)) | |
141 | #endif /* !USE_RTL_THREAD_API */ | |
142 | ||
143 | typedef THREAD_RET_TYPE thread_func_t(void *); | |
144 | ||
145 | ||
146 | START_EXTERN_C | |
147 | ||
148 | #if defined(PERLDLL) && defined(USE_DECLSPEC_THREAD) && (!defined(__BORLANDC__) || defined(_DLL)) | |
149 | extern __declspec(thread) void *PL_current_context; | |
150 | #define PERL_SET_CONTEXT(t) (PL_current_context = t) | |
151 | #define PERL_GET_CONTEXT PL_current_context | |
152 | #else | |
153 | #define PERL_GET_CONTEXT Perl_get_context() | |
154 | #define PERL_SET_CONTEXT(t) Perl_set_context(t) | |
155 | #endif | |
156 | ||
e1caacb4 JH |
157 | END_EXTERN_C |
158 | ||
159 | #define INIT_THREADS NOOP | |
160 | #define ALLOC_THREAD_KEY \ | |
161 | STMT_START { \ | |
162 | if ((PL_thr_key = TlsAlloc()) == TLS_OUT_OF_INDEXES) { \ | |
216db7ee | 163 | PerlIO_printf(PerlIO_stderr(),"panic: TlsAlloc"); \ |
e1caacb4 JH |
164 | exit(1); \ |
165 | } \ | |
166 | } STMT_END | |
167 | ||
216db7ee VK |
168 | #define FREE_THREAD_KEY \ |
169 | STMT_START { \ | |
170 | TlsFree(PL_thr_key); \ | |
171 | } STMT_END | |
172 | ||
173 | #define PTHREAD_ATFORK(prepare,parent,child) NOOP | |
174 | ||
e1caacb4 JH |
175 | #if defined(USE_RTL_THREAD_API) && !defined(_MSC_VER) |
176 | #define JOIN(t, avp) \ | |
177 | STMT_START { \ | |
178 | if ((WaitForSingleObject((t)->self,INFINITE) == WAIT_FAILED) \ | |
179 | || (GetExitCodeThread((t)->self,(LPDWORD)(avp)) == 0) \ | |
180 | || (CloseHandle((t)->self) == 0)) \ | |
181 | Perl_croak_nocontext("panic: JOIN"); \ | |
182 | *avp = (AV *)((t)->i.retv); \ | |
183 | } STMT_END | |
184 | #else /* !USE_RTL_THREAD_API || _MSC_VER */ | |
185 | #define JOIN(t, avp) \ | |
186 | STMT_START { \ | |
187 | if ((WaitForSingleObject((t)->self,INFINITE) == WAIT_FAILED) \ | |
188 | || (GetExitCodeThread((t)->self,(LPDWORD)(avp)) == 0) \ | |
189 | || (CloseHandle((t)->self) == 0)) \ | |
190 | Perl_croak_nocontext("panic: JOIN"); \ | |
191 | } STMT_END | |
192 | #endif /* !USE_RTL_THREAD_API || _MSC_VER */ | |
193 | ||
194 | #define YIELD Sleep(0) | |
195 | ||
196 | #endif /* _WIN32THREAD_H */ | |
197 |