execution_context.cpp

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#include <yaclib/fault/detail/fiber/execution_context.hpp>
 
#include <cstdlib>
 
namespace yaclib::detail::fiber {
 
void ExecutionContext::Setup(Allocation stack, Trampoline trampoline, void* arg) {
  if (getcontext(&_context) == -1) {
    abort();
  }
  _context.uc_stack.ss_sp = stack.start;
  _context.uc_stack.ss_size = stack.size;
  makecontext(&_context, reinterpret_cast<void (*)()>(trampoline), 1, arg);
}
 
void ExecutionContext::Start() {
#ifdef YACLIB_ASAN
  __sanitizer_finish_switch_fiber(nullptr, nullptr, nullptr);
#endif
}
 
void ExecutionContext::SwitchTo(ExecutionContext& other) {
#ifdef YACLIB_ASAN
  void* fake_stack{nullptr};
  __sanitizer_start_switch_fiber(&fake_stack, other._context.uc_stack.ss_sp, other._context.uc_stack.ss_size);
#endif
  swapcontext(&_context, &other._context);
#ifdef YACLIB_ASAN
  __sanitizer_finish_switch_fiber(fake_stack, nullptr, nullptr);
#endif
}
 
void ExecutionContext::Exit(ExecutionContext& other) {
#ifdef YACLIB_ASAN
  __sanitizer_start_switch_fiber(nullptr, other._context.uc_stack.ss_sp, other._context.uc_stack.ss_size);
#endif
  setcontext(&other._context);
}
 
}  // namespace yaclib::detail::fiber