wince/win32thread.h

   1 /* Time-stamp: <01/08/01 21:00:36 keuchel@w2k> */
   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
 159 #if defined(USE_5005THREADS)
 160 struct perl_thread;
 161 int Perl_thread_create (struct perl_thread *thr, thread_func_t *fn);
 162 void Perl_set_thread_self (struct perl_thread *thr);
 163 void Perl_init_thread_intern (struct perl_thread *t);
 164
 165 #define SET_THREAD_SELF(thr) Perl_set_thread_self(thr)
 166
 167 #endif /* USE_5005THREADS */
 168
 169 END_EXTERN_C
 170
 171 #define INIT_THREADS            NOOP
 172 #define ALLOC_THREAD_KEY \
 173     STMT_START {                                                        \
 174         if ((PL_thr_key = TlsAlloc()) == TLS_OUT_OF_INDEXES) {          \
 175             fprintf(stderr,"panic: TlsAlloc");                          \
 176             exit(1);                                                    \
 177         }                                                               \
 178     } STMT_END
 179
 180 #if defined(USE_RTL_THREAD_API) && !defined(_MSC_VER)
 181 #define JOIN(t, avp)                                                    \
 182     STMT_START {                                                        \
 183         if ((WaitForSingleObject((t)->self,INFINITE) == WAIT_FAILED)    \
 184              || (GetExitCodeThread((t)->self,(LPDWORD)(avp)) == 0)      \
 185              || (CloseHandle((t)->self) == 0))                          \
 186             Perl_croak_nocontext("panic: JOIN");                        \
 187         *avp = (AV *)((t)->i.retv);                                     \
 188     } STMT_END
 189 #else   /* !USE_RTL_THREAD_API || _MSC_VER */
 190 #define JOIN(t, avp)                                                    \
 191     STMT_START {                                                        \
 192         if ((WaitForSingleObject((t)->self,INFINITE) == WAIT_FAILED)    \
 193              || (GetExitCodeThread((t)->self,(LPDWORD)(avp)) == 0)      \
 194              || (CloseHandle((t)->self) == 0))                          \
 195             Perl_croak_nocontext("panic: JOIN");                        \
 196     } STMT_END
 197 #endif  /* !USE_RTL_THREAD_API || _MSC_VER */
 198
 199 #define YIELD                   Sleep(0)
 200
 201 #endif /* _WIN32THREAD_H */
 202