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1 | /* Time-stamp: <01/08/01 21:00:36 keuchel@w2k> */ |
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2 | |
3 | #ifndef _WIN32THREAD_H |
4 | #define _WIN32THREAD_H |
5 | |
6 | #include "win32.h" |
7 | |
8 | typedef struct win32_cond { LONG waiters; HANDLE sem; } perl_cond; |
9 | typedef DWORD perl_key; |
10 | typedef HANDLE perl_os_thread; |
11 | |
12 | #ifndef DONT_USE_CRITICAL_SECTION |
13 | |
14 | /* Critical Sections used instead of mutexes: lightweight, |
15 | * but can't be communicated to child processes, and can't get |
16 | * HANDLE to it for use elsewhere. |
17 | */ |
18 | typedef CRITICAL_SECTION perl_mutex; |
19 | #define MUTEX_INIT(m) InitializeCriticalSection(m) |
20 | #define MUTEX_LOCK(m) EnterCriticalSection(m) |
21 | #define MUTEX_UNLOCK(m) LeaveCriticalSection(m) |
22 | #define MUTEX_DESTROY(m) DeleteCriticalSection(m) |
23 | |
24 | #else |
25 | |
26 | typedef HANDLE perl_mutex; |
27 | # define MUTEX_INIT(m) \ |
28 | STMT_START { \ |
29 | if ((*(m) = CreateMutex(NULL,FALSE,NULL)) == NULL) \ |
30 | Perl_croak_nocontext("panic: MUTEX_INIT"); \ |
31 | } STMT_END |
32 | |
33 | # define MUTEX_LOCK(m) \ |
34 | STMT_START { \ |
35 | if (WaitForSingleObject(*(m),INFINITE) == WAIT_FAILED) \ |
36 | Perl_croak_nocontext("panic: MUTEX_LOCK"); \ |
37 | } STMT_END |
38 | |
39 | # define MUTEX_UNLOCK(m) \ |
40 | STMT_START { \ |
41 | if (ReleaseMutex(*(m)) == 0) \ |
42 | Perl_croak_nocontext("panic: MUTEX_UNLOCK"); \ |
43 | } STMT_END |
44 | |
45 | # define MUTEX_DESTROY(m) \ |
46 | STMT_START { \ |
47 | if (CloseHandle(*(m)) == 0) \ |
48 | Perl_croak_nocontext("panic: MUTEX_DESTROY"); \ |
49 | } STMT_END |
50 | |
51 | #endif |
52 | |
53 | /* These macros assume that the mutex associated with the condition |
54 | * will always be held before COND_{SIGNAL,BROADCAST,WAIT,DESTROY}, |
55 | * so there's no separate mutex protecting access to (c)->waiters |
56 | */ |
57 | #define COND_INIT(c) \ |
58 | STMT_START { \ |
59 | (c)->waiters = 0; \ |
60 | (c)->sem = CreateSemaphore(NULL,0,LONG_MAX,NULL); \ |
61 | if ((c)->sem == NULL) \ |
62 | Perl_croak_nocontext("panic: COND_INIT (%ld)",GetLastError()); \ |
63 | } STMT_END |
64 | |
65 | #define COND_SIGNAL(c) \ |
66 | STMT_START { \ |
67 | if ((c)->waiters > 0 && \ |
68 | ReleaseSemaphore((c)->sem,1,NULL) == 0) \ |
69 | Perl_croak_nocontext("panic: COND_SIGNAL (%ld)",GetLastError()); \ |
70 | } STMT_END |
71 | |
72 | #define COND_BROADCAST(c) \ |
73 | STMT_START { \ |
74 | if ((c)->waiters > 0 && \ |
75 | ReleaseSemaphore((c)->sem,(c)->waiters,NULL) == 0) \ |
76 | Perl_croak_nocontext("panic: COND_BROADCAST (%ld)",GetLastError());\ |
77 | } STMT_END |
78 | |
79 | #define COND_WAIT(c, m) \ |
80 | STMT_START { \ |
81 | (c)->waiters++; \ |
82 | MUTEX_UNLOCK(m); \ |
83 | /* Note that there's no race here, since a \ |
84 | * COND_BROADCAST() on another thread will have seen the\ |
85 | * right number of waiters (i.e. including this one) */ \ |
86 | if (WaitForSingleObject((c)->sem,INFINITE)==WAIT_FAILED)\ |
87 | Perl_croak_nocontext("panic: COND_WAIT (%ld)",GetLastError()); \ |
88 | /* XXX there may be an inconsequential race here */ \ |
89 | MUTEX_LOCK(m); \ |
90 | (c)->waiters--; \ |
91 | } STMT_END |
92 | |
93 | #define COND_DESTROY(c) \ |
94 | STMT_START { \ |
95 | (c)->waiters = 0; \ |
96 | if (CloseHandle((c)->sem) == 0) \ |
97 | Perl_croak_nocontext("panic: COND_DESTROY (%ld)",GetLastError()); \ |
98 | } STMT_END |
99 | |
100 | #define DETACH(t) \ |
101 | STMT_START { \ |
102 | if (CloseHandle((t)->self) == 0) { \ |
103 | MUTEX_UNLOCK(&(t)->mutex); \ |
104 | Perl_croak_nocontext("panic: DETACH"); \ |
105 | } \ |
106 | } STMT_END |
107 | |
108 | |
109 | #define THREAD_CREATE(t, f) Perl_thread_create(t, f) |
110 | #define THREAD_POST_CREATE(t) NOOP |
111 | |
112 | /* XXX Docs mention that the RTL versions of thread creation routines |
113 | * should be used, but that advice only seems applicable when the RTL |
114 | * is not in a DLL. RTL DLLs in both Borland and VC seem to do all of |
115 | * the init/deinit required upon DLL_THREAD_ATTACH/DETACH. So we seem |
116 | * to be completely safe using straight Win32 API calls, rather than |
117 | * the much braindamaged RTL calls. |
118 | * |
119 | * _beginthread() in the RTLs call CloseHandle() just after the thread |
120 | * function returns, which means: 1) we have a race on our hands |
121 | * 2) it is impossible to implement join() semantics. |
122 | * |
123 | * IOW, do *NOT* turn on USE_RTL_THREAD_API! It is here |
124 | * for experimental purposes only. GSAR 98-01-02 |
125 | */ |
126 | #ifdef USE_RTL_THREAD_API |
127 | # include <process.h> |
128 | # if defined(__BORLANDC__) |
129 | /* Borland RTL doesn't allow a return value from thread function! */ |
130 | # define THREAD_RET_TYPE void _USERENTRY |
131 | # define THREAD_RET_CAST(p) ((void)(thr->i.retv = (void *)(p))) |
132 | # elif defined (_MSC_VER) |
133 | # define THREAD_RET_TYPE unsigned __stdcall |
134 | # define THREAD_RET_CAST(p) ((unsigned)(p)) |
135 | # else |
136 | /* CRTDLL.DLL doesn't allow a return value from thread function! */ |
137 | # define THREAD_RET_TYPE void __cdecl |
138 | # define THREAD_RET_CAST(p) ((void)(thr->i.retv = (void *)(p))) |
139 | # endif |
140 | #else /* !USE_RTL_THREAD_API */ |
141 | # define THREAD_RET_TYPE DWORD WINAPI |
142 | # define THREAD_RET_CAST(p) ((DWORD)(p)) |
143 | #endif /* !USE_RTL_THREAD_API */ |
144 | |
145 | typedef THREAD_RET_TYPE thread_func_t(void *); |
146 | |
147 | |
148 | START_EXTERN_C |
149 | |
150 | #if defined(PERLDLL) && defined(USE_DECLSPEC_THREAD) && (!defined(__BORLANDC__) || defined(_DLL)) |
151 | extern __declspec(thread) void *PL_current_context; |
152 | #define PERL_SET_CONTEXT(t) (PL_current_context = t) |
153 | #define PERL_GET_CONTEXT PL_current_context |
154 | #else |
155 | #define PERL_GET_CONTEXT Perl_get_context() |
156 | #define PERL_SET_CONTEXT(t) Perl_set_context(t) |
157 | #endif |
158 | |
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159 | END_EXTERN_C |
160 | |
161 | #define INIT_THREADS NOOP |
162 | #define ALLOC_THREAD_KEY \ |
163 | STMT_START { \ |
164 | if ((PL_thr_key = TlsAlloc()) == TLS_OUT_OF_INDEXES) { \ |
165 | fprintf(stderr,"panic: TlsAlloc"); \ |
166 | exit(1); \ |
167 | } \ |
168 | } STMT_END |
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 | |