ceph/src/boost/libs/fiber/src/fiber.cpp

   1
   2 //          Copyright Oliver Kowalke 2013.
   3 // Distributed under the Boost Software License, Version 1.0.
   4 //    (See accompanying file LICENSE_1_0.txt or copy at
   5 //          http://www.boost.org/LICENSE_1_0.txt)
   6
   7 #include "boost/fiber/fiber.hpp"
   8
   9 #include <system_error>
  10
  11 #include <boost/assert.hpp>
  12
  13 #include "boost/fiber/exceptions.hpp"
  14 #include "boost/fiber/scheduler.hpp"
  15
  16 #ifdef BOOST_HAS_ABI_HEADERS
  17 #  include BOOST_ABI_PREFIX
  18 #endif
  19
  20 namespace boost {
  21 namespace fibers {
  22
  23 void
  24 fiber::start_() noexcept {
  25     context * ctx = context::active();
  26     ctx->attach( impl_.get() );
  27     switch ( impl_->get_policy() ) {
  28     case launch::post:
  29         // push new fiber to ready-queue
  30         // resume executing current fiber
  31         ctx->get_scheduler()->schedule( impl_.get() );
  32         break;
  33     case launch::dispatch:
  34         // resume new fiber and push current fiber
  35         // to ready-queue
  36         impl_->resume( ctx);
  37         break;
  38     default:
  39         BOOST_ASSERT_MSG( false, "unknown launch-policy");
  40     }
  41 }
  42
  43 void
  44 fiber::join() {
  45     // FIXME: must fiber::join() be synchronized?
  46     if ( BOOST_UNLIKELY( context::active()->get_id() == get_id() ) ) {
  47         throw fiber_error{ std::make_error_code( std::errc::resource_deadlock_would_occur),
  48                            "boost fiber: trying to join itself" };
  49     }
  50     if ( BOOST_UNLIKELY( ! joinable() ) ) {
  51         throw fiber_error{ std::make_error_code( std::errc::invalid_argument),
  52                            "boost fiber: fiber not joinable" };
  53     }
  54     impl_->join();
  55     impl_.reset();
  56 }
  57
  58 void
  59 fiber::detach() {
  60     if ( BOOST_UNLIKELY( ! joinable() ) ) {
  61         throw fiber_error{ std::make_error_code( std::errc::invalid_argument),
  62                            "boost fiber: fiber not joinable" };
  63     }
  64     impl_.reset();
  65 }
  66
  67 }}
  68
  69 #ifdef BOOST_HAS_ABI_HEADERS
  70 #  include BOOST_ABI_SUFFIX
  71 #endif