* cygwin.din (ualarm): New export.

* dcrt0.cc (_dll_crt0): Add experimental tls storage declaration.
(dll_crt0): Ditto.
* debug.cc (thread_stub): Ditto.
* thread.cc: Minor cleanup.
(__pthread_create): Add experimental tls storage declaration.
* miscfuncs.cc: Define tls index.
* winsup.h: Declare experimental tls storage.
* window.cc (alarm): Use old timer return from setitimer.
(ualarm): New function.

winsup/cygwin/winbase.h

@@ -0,0 +1,84 @@
+#include_next "winbase.h"
+
+#ifndef _WINBASE2_H
+#define _WINBASE2_H
+
+extern __inline__ long ilockincr (long *m)
+{
+  register int __res;
+  __asm__ __volatile__ ("\n\
+	movl	$1,%0\n\
+	lock	xadd %0,(%1)\n\
+	inc	%0\n\
+	": "=a" (__res), "=r" (m): "1" (m));
+  return __res;
+}
+extern __inline__ long ilockdecr (long *m)
+{
+  register int __res;
+  __asm__ __volatile__ ("\n\
+	movl	$0xffffffff,%0\n\
+	lock	xadd %0,(%1)\n\
+	dec	%0\n\
+	": "=a" (__res), "=r" (m): "1" (m));
+  return __res;
+}
+extern __inline__ long ilockexch (long *t, long v)
+{
+  register int __res;
+  __asm__ __volatile__ ("\n\
+	movl	(%2),%0\n\
+1:	lock	cmpxchgl %3,(%1)\n\
+	jne 1b\n\
+ 	": "=a" (__res), "=c" (t): "1" (t), "d" (v));
+  return __res;
+}
+
+#undef InterlockedIncrement
+#define InterlockedIncrement ilockincr
+#undef InterlockedDecrement
+#define InterlockedDecrement ilockdecr
+#undef InterlockedExchange
+#define InterlockedExchange ilockexch
+
+extern long tls_ix;
+
+extern __inline__ DWORD
+my_tlsalloc ()
+{
+  return (DWORD) ilockincr (&tls_ix);
+}
+
+extern __inline__ BOOL
+my_tlssetvalue (DWORD ix, void *val)
+{
+  char **stackbase;
+  __asm__ volatile ("movl %%fs:4,%0": "=g" (stackbase));
+  stackbase[-ix] = (char *) val;
+  return 1;
+}
+
+extern __inline__ void *
+my_tlsgetvalue (DWORD ix)
+{
+  char **stackbase;
+  __asm__ volatile ("movl %%fs:4,%0": "=g" (stackbase));
+  return stackbase[-ix];
+}
+
+extern __inline__ BOOL
+my_tlsfree (DWORD ix)
+{
+  /* nothing for now */
+  return 1;
+}
+
+#undef TlsAlloc
+#define TlsAlloc my_tlsalloc
+#undef TlsGetValue
+#define TlsGetValue my_tlsgetvalue
+#undef TlsSetValue
+#define TlsSetValue my_tlssetvalue
+#undef TlsFree
+#define TlsFree my_tlsfree
+#endif /*_WINBASE2_H*/