From 36f0ed4155fdab7b12c5c5ddf4252170fac0a77e Mon Sep 17 00:00:00 2001
From: rpj <rpj>
Date: Sun, 3 Jan 1999 18:47:50 +0000
Subject: Merge John Bossom's code into the main trunk. See ChangeLog for
 details. This will be tagged as snapshot-1999-01-04-1305

---
 misc.c | 211 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 198 insertions(+), 13 deletions(-)

(limited to 'misc.c')

diff --git a/misc.c b/misc.c
index 659a4eb..f49cd51 100644
--- a/misc.c
+++ b/misc.c
@@ -8,6 +8,7 @@
 #include <errno.h>
 
 #include "pthread.h"
+#include "implement.h"
 
 int
 pthread_once(pthread_once_t *once_control,
@@ -39,25 +40,209 @@ pthread_once(pthread_once_t *once_control,
   return 0;
 }
 
+/*
+ * Code contributed by John E. Bossom <JEB>.
+ */
+
 pthread_t
-pthread_self(void)
+pthread_self (void)
+     /*
+      * ------------------------------------------------------
+      * DOCPUBLIC
+      *      This function returns a reference to the current running
+      *      thread.
+      *
+      * PARAMETERS
+      *      N/A
+      *
+      *
+      * DESCRIPTION
+      *      This function returns a reference to the current running
+      *      thread.
+      *
+      * RESULTS
+      *              pthread_t       reference to the current thread
+      *
+      * ------------------------------------------------------
+      */
 {
-  pthread_t ret;
-  /* This TLS index is allocated on DLL load by dll.c */
-  extern DWORD _pthread_threadID_TlsIndex;
- 
-  ret = (pthread_t) TlsGetValue(_pthread_threadID_TlsIndex);
+  pthread_t self = NULL;
+  /*
+   * need to ensure there always is a self
+   */
 
-  if (ret == 0)
+  if ((self = pthread_getspecific (_pthread_selfThreadKey)) == NULL)
     {
-      /* FIXME: Oh no! This can't happen. */
+      /*
+       * Need to create an implicit 'self' for the currently
+       * executing thread.
+       */
+      self = (pthread_t) calloc (1, sizeof (*self));
+      if (self != NULL)
+	{
+
+	  self->implicit = 1;
+	  self->detachState = PTHREAD_CREATE_DETACHED;
+
+	  self->thread = GetCurrentThreadId ();
+	  self->threadH = GetCurrentThread ();
+	}
+
+      pthread_setspecific (_pthread_selfThreadKey, self);
     }
 
-  return ret;
-}
+  return (self);
+
+}				/* pthread_self */
 
 int
-pthread_equal(pthread_t t1, pthread_t t2)
+pthread_equal (pthread_t t1, pthread_t t2)
+     /*
+      * ------------------------------------------------------
+      * DOCPUBLIC
+      *      This function returns zero if t1 and t2 are equal, else
+      *      returns nonzero
+      *
+      * PARAMETERS
+      *      t1,
+      *      t2
+      *              references to an instances of thread_t
+      *
+      *
+      * DESCRIPTION
+      *      This function returns zero if t1 and t2 are equal, else
+      *      returns nonzero.
+      *
+      * RESULTS
+      *              0               if t1 and t2 refer to the same thread,
+      *              non-zero        t1 and t2 do not refer to the same thread
+      *
+      * ------------------------------------------------------
+      */
 {
-  return (t1 == t2);
-}
+  int result;
+
+  result = !((t1 == t2) || (t1->thread == t2->thread));
+
+  return (result);
+
+}				/* pthread_equal */
+
+
+int
+pthreadCancelableWait (HANDLE waitHandle)
+     /*
+      * -------------------------------------------------------------------
+      * This provides an extra hook into the pthread_cancel
+      * mechanism that will allow you to wait on a Windows handle and make it a
+      * cancellation point. This function blocks until the given WIN32 handle is
+      * signaled or pthread_cancel has been called. It is implemented using
+      * WaitForMultipleObjects on 'waitHandle' and a manually reset WIN32
+      * event used to implement pthread_cancel.
+      * 
+      * Given this hook it would be possible to implement more of the cancellation
+      * points.
+      * -------------------------------------------------------------------
+      */
+{
+  int result;
+  pthread_t self;
+  HANDLE handles[2];
+  DWORD nHandles = 1;
+  DWORD status;
+
+
+  handles[0] = waitHandle;
+
+  if ((self = pthread_getspecific (_pthread_selfThreadKey)) != NULL)
+    {
+      /*
+       * Get cancelEvent handle
+       */
+      if (self->cancelState == PTHREAD_CANCEL_ENABLE)
+        {
+
+          if ((handles[1] = self->cancelEvent) != NULL)
+            {
+              nHandles++;
+            }
+        }
+    }
+  else
+    {
+      handles[1] = NULL;
+    }
+
+  status = WaitForMultipleObjects (
+                                    nHandles,
+                                    handles,
+                                    FALSE,
+                                    INFINITE);
+
+
+  if (status == WAIT_FAILED)
+    {
+      result = EINVAL;
+
+    }
+  else if (status == WAIT_ABANDONED_0)
+    {
+      result = EINVAL;
+
+    }
+  else
+    {
+      /*
+       * Either got the mutex or the cancel event
+       * was signaled
+       */
+      switch (status - WAIT_OBJECT_0)
+        {
+
+        case 0:
+          /*
+           * Got the mutex
+           */
+          result = 0;
+          break;
+
+        case 1:
+          /*
+           * Got cancel request
+           */
+          ResetEvent (handles[1]);
+
+          if (self != NULL && !self->implicit)
+            {
+              /*
+               * Thread started with pthread_create
+               */
+              DWORD exceptionInformation[3];
+
+              exceptionInformation[0] = (DWORD) (0);
+              exceptionInformation[1] = (DWORD) (0);
+
+              RaiseException (
+                               EXCEPTION_PTHREAD_SERVICES,
+                               0,
+                               3,
+                               exceptionInformation);
+            }
+
+
+          ((void *) -1);
+          break;
+
+        default:
+          result = EINVAL;
+          break;
+        }
+    }
+
+  return (result);
+
+}                               /* pthreadCancelableWait */
+
+
+/* </JEB> */
+
-- 
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