[PATCH 9/9] uClibc: introduce UCLIBC_HAS_CONTEXT_FUNCS configuration symbol

Florian Fainelli florian at openwrt.org
Mon Dec 31 14:38:32 UTC 2012


This option is introduced to conditionnaly enable the support for the
{get,set,swap,make}context functions. Based on a initial patch by Carmelo
Amoroso.

Signed-off-by: Carmelo Amoroso <carmelo.amoroso at st.com>
Signed-off-by: Florian Fainelli <florian at openwrt.org>
---
 extra/Configs/Config.in |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/extra/Configs/Config.in b/extra/Configs/Config.in
index d0204bb..342f9c3 100644
--- a/extra/Configs/Config.in
+++ b/extra/Configs/Config.in
@@ -681,6 +681,20 @@ config UCLIBC_SUSV3_LEGACY
 
 	  WARNING! ABI incompatibility.
 
+config UCLIBC_HAS_CONTEXT_FUNCS
+	bool "Use obsolescent context control functions"
+	default n
+	depends on UCLIBC_SUSV3_LEGACY && ARCH_HAS_UCONTEXT
+	help
+	  Add into library the SuSv3 obsolescent functions used for context
+	  control. The setcontext family allows the implementation in C of
+	  advanced control flow patterns such as iterators, fibers, and
+	  coroutines. They may be viewed as an advanced version of
+	  setjmp/longjmp; whereas the latter allows only a single non-local jump
+	  up the stack, setcontext allows the creation of multiple cooperative
+	  threads of control, each with its own stack.
+	  These functions are: setcontext, getcontext, makecontext, swapcontext.
+
 config UCLIBC_SUSV3_LEGACY_MACROS
 	bool "Enable SuSv3 LEGACY macros"
 	help
-- 
1.7.10.4



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