--- libcoro/coro.h	2006/10/26 07:27:50	1.15
+++ libcoro/coro.h	2007/04/27 19:26:18	1.20
@@ -38,6 +38,8 @@
 /*
  * 2006-10-26 Include stddef.h on OS X to work around one of its bugs.
  *            Reported by Michael_G_Schwern.
+ * 2006-11-26 Use _setjmp instead of setjmp on GNU/Linux.
+ * 2007-04-27 Set unwind frame info if gcc 3+ and ELF is detected.
  */
 
 #ifndef CORO_H
@@ -100,9 +102,9 @@
 typedef void (*coro_func)(void *);
 
 /*
- * A coroutine state is saved in the following structure. Treat it as a
+ * A coroutine state is saved in the following structure. Treat it as an
  * opaque type. errno and sigmask might be saved, but don't rely on it,
- * implement your own switching primitive if you need it.
+ * implement your own switching primitive if you need that.
  */
 typedef struct coro_context coro_context;
 
@@ -114,9 +116,11 @@
  * Allocating/deallocating the stack is your own responsibility, so there is
  * no coro_destroy function.
  */
-void coro_create (coro_context *ctx,
-                  coro_func coro, void *arg,
-                  void *sptr, long ssize);
+void coro_create (coro_context *ctx, /* an uninitialised coro_context */
+                  coro_func coro,    /* the coroutine code to be executed */
+                  void *arg,         /* a single pointer passed to the coro */
+                  void *sptr,        /* start of stack area */
+                  long ssize);       /* size of stack area */
 
 /*
  * The following prototype defines the coroutine switching function. It is
@@ -161,7 +165,7 @@
 #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX
 
 #if defined(CORO_LINUX) && !defined(_GNU_SOURCE)
-# define _GNU_SOURCE // for linux libc
+# define _GNU_SOURCE /* for linux libc */
 #endif
 
 #include <setjmp.h>
@@ -170,7 +174,11 @@
   jmp_buf env;
 };
 
-#define coro_transfer(p,n) do { if (!setjmp ((p)->env)) longjmp ((n)->env, 1); } while(0)
+#if CORO_LINUX
+# define coro_transfer(p,n) do { if (!_setjmp ((p)->env)) _longjmp ((n)->env, 1); } while (0)
+#else
+# define coro_transfer(p,n) do { if (!setjmp  ((p)->env)) longjmp  ((n)->env, 1); } while (0)
+#endif
 
 #endif