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Integrate mainline changes into win32 branch. Now would be a good time
[perl5.git] / win32 / win32thread.h
1 #ifndef _WIN32THREAD_H
2 #define _WIN32THREAD_H
3 typedef struct win32_cond { LONG waiters; HANDLE sem; } perl_cond;
4 typedef DWORD perl_key;
5 typedef HANDLE perl_thread;
6
7 #ifndef DONT_USE_CRITICAL_SECTION
8
9 /* Critical Sections used instead of mutexes: lightweight,
10  * but can't be communicated to child processes, and can't get
11  * HANDLE to it for use elsewhere.
12  */
13 typedef CRITICAL_SECTION perl_mutex;
14 #define MUTEX_INIT(m) InitializeCriticalSection(m)
15 #define MUTEX_LOCK(m) EnterCriticalSection(m)
16 #define MUTEX_UNLOCK(m) LeaveCriticalSection(m)
17 #define MUTEX_DESTROY(m) DeleteCriticalSection(m)
18
19 #else
20
21 typedef HANDLE perl_mutex;
22 #define MUTEX_INIT(m) \
23     STMT_START {                                                \
24         if ((*(m) = CreateMutex(NULL,FALSE,NULL)) == NULL)      \
25             croak("panic: MUTEX_INIT");                         \
26     } STMT_END
27 #define MUTEX_LOCK(m) \
28     STMT_START {                                                \
29         if (WaitForSingleObject(*(m),INFINITE) == WAIT_FAILED)  \
30             croak("panic: MUTEX_LOCK");                         \
31     } STMT_END
32 #define MUTEX_UNLOCK(m) \
33     STMT_START {                                                \
34         if (ReleaseMutex(*(m)) == 0)                            \
35             croak("panic: MUTEX_UNLOCK");                       \
36     } STMT_END
37 #define MUTEX_DESTROY(m) \
38     STMT_START {                                                \
39         if (CloseHandle(*(m)) == 0)                             \
40             croak("panic: MUTEX_DESTROY");                      \
41     } STMT_END
42
43 #endif
44
45 /* These macros assume that the mutex associated with the condition
46  * will always be held before COND_{SIGNAL,BROADCAST,WAIT,DESTROY},
47  * so there's no separate mutex protecting access to (c)->waiters
48  */
49 #define COND_INIT(c) \
50     STMT_START {                                                \
51         (c)->waiters = 0;                                       \
52         (c)->sem = CreateSemaphore(NULL,0,LONG_MAX,NULL);       \
53         if ((c)->sem == NULL)                                   \
54             croak("panic: COND_INIT (%ld)",GetLastError());     \
55     } STMT_END
56
57 #define COND_SIGNAL(c) \
58     STMT_START {                                                \
59         if ((c)->waiters > 0 &&                                 \
60             ReleaseSemaphore((c)->sem,1,NULL) == 0)             \
61             croak("panic: COND_SIGNAL (%ld)",GetLastError());   \
62     } STMT_END
63
64 #define COND_BROADCAST(c) \
65     STMT_START {                                                \
66         if ((c)->waiters > 0 &&                                 \
67             ReleaseSemaphore((c)->sem,(c)->waiters,NULL) == 0)  \
68             croak("panic: COND_BROADCAST (%ld)",GetLastError());\
69     } STMT_END
70
71 #define COND_WAIT(c, m) \
72     STMT_START {                                                \
73         (c)->waiters++;                                         \
74         MUTEX_UNLOCK(m);                                        \
75         /* Note that there's no race here, since a              \
76          * COND_BROADCAST() on another thread will have seen the\
77          * right number of waiters (i.e. including this one) */ \
78         if (WaitForSingleObject((c)->sem,INFINITE)==WAIT_FAILED)\
79             croak("panic: COND_WAIT (%ld)",GetLastError());     \
80         /* XXX there may be an inconsequential race here */     \
81         MUTEX_LOCK(m);                                          \
82         (c)->waiters--;                                         \
83     } STMT_END
84
85 #define COND_DESTROY(c) \
86     STMT_START {                                                \
87         (c)->waiters = 0;                                       \
88         if (CloseHandle((c)->sem) == 0)                         \
89             croak("panic: COND_DESTROY (%ld)",GetLastError());  \
90     } STMT_END
91
92 #define DETACH(t) \
93     STMT_START {                                                \
94         if (CloseHandle((t)->self) == 0) {                      \
95             MUTEX_UNLOCK(&(t)->mutex);                          \
96             croak("panic: DETACH");                             \
97         }                                                       \
98     } STMT_END
99
100 #define THR ((struct thread *) TlsGetValue(thr_key))
101 #define THREAD_CREATE(t, f)     Perl_thread_create(t, f)
102 #define THREAD_POST_CREATE(t)   NOOP
103 #define THREAD_RET_TYPE         DWORD WINAPI
104 #define THREAD_RET_CAST(p)      ((DWORD)(p))
105
106 typedef THREAD_RET_TYPE thread_func_t(void *);
107
108 START_EXTERN_C
109 void Perl_alloc_thread_key _((void));
110 int Perl_thread_create _((struct thread *thr, thread_func_t *fn));
111 void Perl_set_thread_self _((struct thread *thr));
112 END_EXTERN_C
113
114 #define INIT_THREADS NOOP
115 #define ALLOC_THREAD_KEY Perl_alloc_thread_key()
116 #define SET_THREAD_SELF(thr) Perl_set_thread_self(thr)
117
118 #define JOIN(t, avp)                                                    \
119     STMT_START {                                                        \
120         if ((WaitForSingleObject((t)->self,INFINITE) == WAIT_FAILED)    \
121              || (GetExitCodeThread((t)->self,(LPDWORD)(avp)) == 0))     \
122             croak("panic: JOIN");                                       \
123     } STMT_END
124
125 #define SET_THR(t)                                      \
126     STMT_START {                                        \
127         if (TlsSetValue(thr_key, (void *) (t)) == 0)    \
128             croak("panic: TlsSetValue");                \
129     } STMT_END
130
131 #define YIELD                   Sleep(0)
132
133 #endif /* _WIN32THREAD_H */