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(&current_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