Decouple quadmath from longdouble.
[perl.git] / win32 / win32thread.h
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