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From 0e054339c1422168a7f4a9dcf090268053a33b1f Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Thu, 20 Jul 2017 21:05:37 -0700
Subject: [PATCH 2/5] wvtask: Dont use ucontext on non-glibc systems
Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
utils/wvtask.cc | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/utils/wvtask.cc b/utils/wvtask.cc
index cdcd544..c0bff7d 100644
--- a/utils/wvtask.cc
+++ b/utils/wvtask.cc
@@ -199,7 +199,9 @@ WvTaskMan::WvTaskMan()
stacktop = (char *)alloca(0);
context_return = 0;
+#ifdef __GLIBC__
assert(getcontext(&get_stack_return) == 0);
+#endif
if (context_return == 0)
{
// initial setup - start the stackmaster() task (never returns!)
@@ -265,13 +267,17 @@ int WvTaskMan::run(WvTask &task, int val)
state = &old_task->mystate;
context_return = 0;
+#ifdef __GLIBC__
assert(getcontext(state) == 0);
+#endif
int newval = context_return;
if (newval == 0)
{
// saved the state, now run the task.
context_return = val;
+#ifdef __GLIBC__
setcontext(&task.mystate);
+#endif
return -1;
}
else
@@ -319,13 +325,17 @@ int WvTaskMan::yield(int val)
#endif
context_return = 0;
+#ifdef __GLIBC__
assert(getcontext(¤t_task->mystate) == 0);
+#endif
int newval = context_return;
if (newval == 0)
{
// saved the task state; now yield to the toplevel.
context_return = val;
+#ifdef __GLIBC__
setcontext(&toplevel);
+#endif
return -1;
}
else
@@ -341,7 +351,9 @@ int WvTaskMan::yield(int val)
void WvTaskMan::get_stack(WvTask &task, size_t size)
{
context_return = 0;
+#ifdef __GLIBC__
assert(getcontext(&get_stack_return) == 0);
+#endif
if (context_return == 0)
{
assert(magic_number == -WVTASK_MAGIC);
@@ -371,7 +383,9 @@ void WvTaskMan::get_stack(WvTask &task, size_t size)
// initial setup
stack_target = &task;
context_return = size/1024 + (size%1024 > 0);
+#ifdef __GLIBC__
setcontext(&stackmaster_task);
+#endif
}
else
{
@@ -409,7 +423,9 @@ void WvTaskMan::_stackmaster()
assert(magic_number == -WVTASK_MAGIC);
context_return = 0;
+#ifdef __GLIBC__
assert(getcontext(&stackmaster_task) == 0);
+#endif
val = context_return;
if (val == 0)
{
@@ -419,7 +435,9 @@ void WvTaskMan::_stackmaster()
// all current stack allocations) and go back to get_stack
// (or the constructor, if that's what called us)
context_return = 1;
+#ifdef __GLIBC__
setcontext(&get_stack_return);
+#endif
}
else
{
@@ -474,7 +492,9 @@ void WvTaskMan::do_task()
// back here from longjmp; someone wants stack space.
context_return = 0;
+#ifdef __GLIBC__
assert(getcontext(&task->mystate) == 0);
+#endif
if (context_return == 0)
{
// done the setjmp; that means the target task now has
@@ -510,7 +530,9 @@ void WvTaskMan::do_task()
}
else
{
+#ifdef __GLIBC__
assert(getcontext(&task->func_call) == 0);
+#endif
task->func_call.uc_stack.ss_size = task->stacksize;
task->func_call.uc_stack.ss_sp = task->stack;
task->func_call.uc_stack.ss_flags = 0;
@@ -521,9 +543,11 @@ void WvTaskMan::do_task()
(void (*)(void))call_func, 1, task);
context_return = 0;
+#ifdef __GLIBC__
assert(getcontext(&task->func_return) == 0);
if (context_return == 0)
setcontext(&task->func_call);
+#endif
}
// the task's function terminated.
--
2.13.3
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