coroutine: some initial bits of this module, incomplete

configure

@@ -3876,7 +3876,7 @@ fi
 
 
 
-LIBMOWGLI_MODULES="core base container concurrent dns eventloop ext linebuf module object thread vio"
+LIBMOWGLI_MODULES="core base container concurrent coroutine dns eventloop ext linebuf module object thread vio"
 
 
 LIBMOWGLI_MODULE_BUILD="$(echo && echo x)"

configure.ac

@@ -30,7 +30,7 @@ AC_CHECK_FUNCS([fcntl kqueue mmap select dispatch_block port_create])
 AC_PATH_PROG(AR, ar)
 AC_PATH_PROG(RANLIB, ranlib)
 
-LIBMOWGLI_MODULES="core base container concurrent dns eventloop ext linebuf module object thread vio"
+LIBMOWGLI_MODULES="core base container concurrent coroutine dns eventloop ext linebuf module object thread vio"
 AC_SUBST(LIBMOWGLI_MODULES)
 
 LIBMOWGLI_MODULE_BUILD="$(echo && echo x)"

src/libmowgli/coroutine/Makefile

@@ -0,0 +1,15 @@
+include ../../../extra.mk
+
+STATIC_PIC_LIB_NOINST = ${LIBMOWGLI_SHARED_COROUTINE}
+STATIC_LIB_NOINST = ${LIBMOWGLI_STATIC_COROUTINE}
+
+SRCS = coroutine.c
+
+INCLUDES := ${SRCS:.c=.h}
+
+include ../../../buildsys.mk
+
+includesubdir = $(PACKAGE_NAME)/coroutine
+
+CPPFLAGS += -I. -I.. -I../../.. -DMOWGLI_CORE
+

src/libmowgli/coroutine/coroutine.c

@@ -0,0 +1,44 @@
+/*
+ * libmowgli: A collection of useful routines for programming.
+ * coroutine.c: coroutines/fibers implementation
+ *
+ * Copyright (c) 2012 William Pitcock <[email protected]>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "mowgli.h"
+#include "coroutine_private.h"
+
+static mowgli_stack_dir_t mowgli_coroutine_get_stack_dir_leaf_ptr(void *callstack_p)
+{
+	mowgli_stack_dir_t dir;
+	void *childstack_p = &callstack_p;
+
+	dir = (childstack_p > callstack_p ? MOWGLI_STACK_GROWS_UP : MOWGLI_STACK_GROWS_DOWN);
+
+	return dir;
+}
+
+mowgli_stack_dir_t mowgli_coroutine_get_stack_dir(void)
+{
+	int dummy1 = 0;
+	void *dummy2 = &dummy1;
+
+	return mowgli_coroutine_get_stack_dir_leaf_ptr(dummy2);
+}
+

src/libmowgli/coroutine/coroutine.h

@@ -0,0 +1,45 @@
+/*
+ * libmowgli: A collection of useful routines for programming.
+ * coroutine.h: coroutines/fibers implementation
+ *
+ * Copyright (c) 2012 William Pitcock <[email protected]>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __MOWGLI_COROUTINE_H__
+#define __MOWGLI_COROUTINE_H__
+
+typedef enum {
+	MOWGLI_STACK_GROWS_DOWN = -1,
+	MOWGLI_STACK_GROWS_UP = 1,
+} mowgli_stack_dir_t;
+
+extern mowgli_stack_dir_t mowgli_coroutine_get_stack_dir(void);
+
+typedef void mowgli_coroutine_t;
+typedef void (*mowgli_coroutine_start_fn_t)(void *userdata);
+
+extern int mowgli_coroutine_create(mowgli_coroutine_start_fn_t start_fn, void *userdata);
+extern void mowgli_coroutine_destroy(mowgli_coroutine_t *coroutine);
+extern void mowgli_coroutine_yield(void);
+extern void mowgli_coroutine_yield_to(mowgli_coroutine_t *next);
+extern void mowgli_coroutine_exit(void);
+extern void mowgli_coroutine_exit_to(mowgli_coroutine_t *next);
+extern mowgli_coroutine_t *mowgli_coroutine_self(void);
+
+#endif

src/libmowgli/mowgli.h

@@ -55,6 +55,8 @@ MOWGLI_DECLS_START
 #include "core/allocation_policy.h"
 #include "core/alloc.h"
 
+#include "coroutine/coroutine.h"
+
 #include "thread/thread.h"
 #include "thread/mutex.h"