1 files changed, 39 insertions, 0 deletions
diff --git a/private.c b/private.c
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index 0000000..a880042
--- /dev/null
+++ b/private.c
@@ -0,0 +1,39 @@
+/*
+ * private.c
+ *
+ * Description:
+ * This translation unit implements routines which are private to
+ * the implementation and may be used throughout it.
+ */
+
+#include <windows.h>
+#include <process.h>
+#include "pthread.h"
+#include "implement.h"
+
+int
+_pthread_getthreadindex(pthread_t thread)
+{
+  /* The hash table works as follows:
+     hash into the table,
+     if the thread in this slot doesn't match then start single
+     stepping from there until we find it.
+
+     The scheme should have these characteristics:
+     - if the thread handle is a sequence number then the hash will
+       succeed first time every time,
+     - if the thread handle is a pseudo randomish value (eg. a pointer)
+       then the hash should succeed first time most times.
+   */
+  int t = _PTHREAD_HASH_INDEX(*thread);
+  int it = t; /* The initial thread index */
+
+  while ((_pthread_threads_table[t])->thread != thread) {
+    t++;
+    if (t == PTHREAD_THREADS_MAX)
+      t = 0; /* Wrap around to the first slot */
+    if (t == it)
+      return -1; /* Failed to find the thread */
+  }
+  return t;
+}