| 1 | |
|---|---|
| 2 | #include "boost/fiber/waker.hpp" |
| 3 | #include "boost/fiber/context.hpp" |
| 4 | |
| 5 | namespace boost { |
| 6 | namespace fibers { |
| 7 | |
| 8 | bool |
| 9 | waker::wake() const noexcept { |
| 10 | BOOST_ASSERT(epoch_ > 0); |
| 11 | BOOST_ASSERT(ctx_ != nullptr); |
| 12 | |
| 13 | return ctx_->wake(epoch_); |
| 14 | } |
| 15 | |
| 16 | void |
| 17 | wait_queue::suspend_and_wait( detail::spinlock_lock & lk, context * active_ctx) { |
| 18 | waker_with_hook w{ active_ctx->create_waker() }; |
| 19 | slist_.push_back(value&: w); |
| 20 | // suspend this fiber |
| 21 | active_ctx->suspend( lk); |
| 22 | BOOST_ASSERT( ! w.is_linked() ); |
| 23 | } |
| 24 | |
| 25 | bool |
| 26 | wait_queue::suspend_and_wait_until( detail::spinlock_lock & lk, |
| 27 | context * active_ctx, |
| 28 | std::chrono::steady_clock::time_point const& timeout_time) { |
| 29 | waker_with_hook w{ active_ctx->create_waker() }; |
| 30 | slist_.push_back(value&: w); |
| 31 | // suspend this fiber |
| 32 | if ( ! active_ctx->wait_until( timeout_time, lk, waker(w)) ) { |
| 33 | // relock local lk |
| 34 | for(;;) { |
| 35 | if(lk.try_lock()) |
| 36 | break; |
| 37 | active_ctx->yield(); |
| 38 | } |
| 39 | // remove from waiting-queue |
| 40 | if ( w.is_linked()) { |
| 41 | slist_.remove( value: w); |
| 42 | } |
| 43 | lk.unlock(); |
| 44 | return false; |
| 45 | } |
| 46 | return true; |
| 47 | } |
| 48 | |
| 49 | void |
| 50 | wait_queue::notify_one() { |
| 51 | while ( ! slist_.empty() ) { |
| 52 | waker & w = slist_.front(); |
| 53 | slist_.pop_front(); |
| 54 | if ( w.wake()) { |
| 55 | break; |
| 56 | } |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | void |
| 61 | wait_queue::notify_all() { |
| 62 | while ( ! slist_.empty() ) { |
| 63 | waker & w = slist_.front(); |
| 64 | slist_.pop_front(); |
| 65 | w.wake(); |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | bool |
| 70 | wait_queue::empty() const { |
| 71 | return slist_.empty(); |
| 72 | } |
| 73 | |
| 74 | } |
| 75 | } |
| 76 |