nt thread support
diff --git a/Python/thread_nt.h b/Python/thread_nt.h
new file mode 100644
index 0000000..453e942
--- /dev/null
+++ b/Python/thread_nt.h
@@ -0,0 +1,245 @@
+/***********************************************************
+Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
+The Netherlands.
+
+ All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in
+supporting documentation, and that the names of Stichting Mathematisch
+Centrum or CWI not be used in advertising or publicity pertaining to
+distribution of the software without specific, written prior permission.
+
+STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
+THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
+FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+******************************************************************/
+
+/* This code implemented by Dag.Gruneau@elsa.preseco.comm.se */
+
+#include "windows.h"
+#include "limits.h"
+
+long get_thread_ident(void);
+
+/*
+ * Change all headers to pure ANSI as no one will use K&R style on an
+ * NT
+ */
+
+/*
+ * Initialization of the C package, should not be needed.
+ */
+static void _init_thread(void)
+{
+}
+
+/*
+ * Thread support.
+ */
+int start_new_thread(void (*func)(void *), void *arg)
+{
+ HANDLE aThread;
+ DWORD aThreadId;
+
+ int success = 0; /* init not needed when SOLARIS_THREADS and */
+ /* C_THREADS implemented properly */
+ dprintf(("%ld: start_new_thread called\n", get_thread_ident()));
+ if (!initialized)
+ init_thread();
+
+ aThread = CreateThread(
+ NULL, /* No security attributes */
+ 0, /* use default stack size */
+ (LPTHREAD_START_ROUTINE) func, /* thread function */
+ (LPVOID) arg, /* argument to thread function */
+ 0, /* use the default creation flags */
+ &aThreadId); /* returns the thread identifier */
+
+ if (aThread != NULL) {
+ CloseHandle(aThread); /* We do not want to have any zombies hanging around */
+ success = 1;
+ dprintf(("%ld: start_new_thread succeeded: %ld\n", get_thread_ident(), aThreadId));
+ }
+
+ return success;
+}
+
+/*
+ * Return the thread Id instead of an handle. The Id is said to uniquely identify the
+ * thread in the system
+ */
+long get_thread_ident(void)
+{
+ if (!initialized)
+ init_thread();
+
+ return GetCurrentThreadId();
+}
+
+static void do_exit_thread(int no_cleanup)
+{
+ dprintf(("%ld: exit_thread called\n", get_thread_ident()));
+ if (!initialized)
+ if (no_cleanup)
+ _exit(0);
+ else
+ exit(0);
+ ExitThread(0);
+}
+
+void exit_thread(void)
+{
+ do_exit_thread(0);
+}
+
+void _exit_thread(void)
+{
+ do_exit_thread(1);
+}
+
+#ifndef NO_EXIT_PROG
+static void do_exit_prog(int status, int no_cleanup)
+{
+ dprintf(("exit_prog(%d) called\n", status));
+ if (!initialized)
+ if (no_cleanup)
+ _exit(status);
+ else
+ exit(status);
+}
+
+void exit_prog(int status)
+{
+ do_exit_prog(status, 0);
+}
+
+void _exit_prog _P1(int status)
+{
+ do_exit_prog(status, 1);
+}
+#endif /* NO_EXIT_PROG */
+
+/*
+ * Lock support. It has too be implemented as semaphores.
+ * I [Dag] tried to implement it with mutex but I could find a way to
+ * tell whether a thread already own the lock or not.
+ */
+type_lock allocate_lock(void)
+{
+ HANDLE aLock;
+
+ dprintf(("allocate_lock called\n"));
+ if (!initialized)
+ init_thread();
+
+ aLock = CreateSemaphore(NULL, /* Security attributes */
+ 1, /* Initial value */
+ 1, /* Maximum value */
+ NULL);
+ /* Name of semaphore */
+
+ dprintf(("%ld: allocate_lock() -> %lx\n", get_thread_ident(), (long)aLock));
+
+ return (type_lock) aLock;
+}
+
+void free_lock(type_lock aLock)
+{
+ dprintf(("%ld: free_lock(%lx) called\n", get_thread_ident(),(long)aLock));
+
+ CloseHandle((HANDLE) aLock);
+}
+
+/*
+ * Return 1 on success if the lock was acquired
+ *
+ * and 0 if the lock was not acquired. This means a 0 is returned
+ * if the lock has already been acquired by this thread!
+ */
+int acquire_lock(type_lock aLock, int waitflag)
+{
+ int success = 1;
+ DWORD waitResult;
+
+ dprintf(("%ld: acquire_lock(%lx, %d) called\n", get_thread_ident(),(long)aLock, waitflag));
+
+ waitResult = WaitForSingleObject((HANDLE) aLock, (waitflag == 1 ? INFINITE : 0));
+
+ if (waitResult != WAIT_OBJECT_0) {
+ success = 0; /* We failed */
+ }
+
+ dprintf(("%ld: acquire_lock(%lx, %d) -> %d\n", get_thread_ident(),(long)aLock, waitflag, success));
+
+ return success;
+}
+
+void release_lock(type_lock aLock)
+{
+ dprintf(("%ld: release_lock(%lx) called\n", get_thread_ident(),(long)aLock));
+
+ if (!ReleaseSemaphore(
+ (HANDLE) aLock, /* Handle of semaphore */
+ 1, /* increment count by one */
+ NULL)) /* not interested in previous count */
+ {
+ dprintf(("%ld: Could not release_lock(%lx) error: %l\n", get_thread_ident(), (long)aLock, GetLastError()));
+ }
+}
+
+/*
+ * Semaphore support.
+ */
+type_sema allocate_sema(int value)
+{
+ HANDLE aSemaphore;
+
+ dprintf(("%ld: allocate_sema called\n", get_thread_ident()));
+ if (!initialized)
+ init_thread();
+
+ aSemaphore = CreateSemaphore( NULL, /* Security attributes */
+ value, /* Initial value */
+ INT_MAX, /* Maximum value */
+ NULL); /* Name of semaphore */
+
+ dprintf(("%ld: allocate_sema() -> %lx\n", get_thread_ident(), (long)aSemaphore));
+
+ return (type_sema) aSemaphore;
+}
+
+void free_sema(type_sema aSemaphore)
+{
+ dprintf(("%ld: free_sema(%lx) called\n", get_thread_ident(), (long)aSemaphore));
+
+ CloseHandle((HANDLE) aSemaphore);
+}
+
+void down_sema(type_sema aSemaphore)
+{
+ DWORD waitResult;
+
+ dprintf(("%ld: down_sema(%lx) called\n", get_thread_ident(), (long)aSemaphore));
+
+ waitResult = WaitForSingleObject( (HANDLE) aSemaphore, INFINITE);
+
+ dprintf(("%ld: down_sema(%lx) return: %l\n", get_thread_ident(),(long) aSemaphore, waitResult));
+}
+
+void up_sema(type_sema aSemaphore)
+{
+ ReleaseSemaphore(
+ (HANDLE) aSemaphore, /* Handle of semaphore */
+ 1, /* increment count by one */
+ NULL); /* not interested in previous count */
+
+ dprintf(("%ld: up_sema(%lx)\n", get_thread_ident(), (long)aSemaphore));
+}