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#include "runtimeContext.h"
#include <stdexcept>
RuntimeContext::RuntimeContext(size_t stacksize) :
swapped(false)
{
stack = malloc(stacksize);
if (getcontext(&ctxCallback) == -1)
throw std::runtime_error("Failed to getcontext");
ctxCallback.uc_stack.ss_sp = stack;
ctxCallback.uc_stack.ss_size = stacksize;
ctxCallback.uc_link = &ctxInitial;
makecontext(&ctxCallback, (void (*)())&RuntimeContext::callbackWrapper, 1, this);
}
RuntimeContext::~RuntimeContext()
{
free(stack);
}
void
RuntimeContext::swapContext()
{
swapped = !swapped;
if (swapped) {
swapcontext(&ctxInitial, &ctxCallback);
}
else {
if (stack) {
swapcontext(&ctxCallback, &ctxInitial);
}
}
}
void
RuntimeContext::callbackWrapper(RuntimeContext * rc)
{
rc->callback();
free(rc->stack);
rc->stack = nullptr;
}
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