| // Copyright 2020 The Pigweed Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| // use this file except in compliance with the License. You may obtain a copy of |
| // the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| // License for the specific language governing permissions and limitations under |
| // the License. |
| |
| #include "pw_thread/sleep.h" |
| |
| #include <algorithm> |
| |
| #include "pw_assert/assert.h" |
| #include "pw_chrono/system_clock.h" |
| #include "pw_chrono_threadx/system_clock_constants.h" |
| #include "pw_thread/id.h" |
| #include "tx_api.h" |
| |
| using pw::chrono::threadx::kMaxTimeout; |
| |
| namespace pw::this_thread { |
| |
| void sleep_for(chrono::SystemClock::duration for_at_least) { |
| PW_DCHECK(get_id() != thread::Id()); |
| |
| // Clamp negative durations to be 0 which maps to non-blocking. |
| for_at_least = std::max(for_at_least, chrono::SystemClock::duration::zero()); |
| |
| // The pw::sleep_{for,until} API contract is to yield if we attempt to sleep |
| // for a duration of 0. ThreadX's tx_thread_sleep does a no-op if 0 is passed, |
| // ergo we explicitly check for the yield condition if the duration is 0. |
| if (for_at_least == chrono::SystemClock::duration::zero()) { |
| tx_thread_relinquish(); // Direct API is used to reduce overhead. |
| return; |
| } |
| |
| while (for_at_least > kMaxTimeout) { |
| const UINT result = tx_thread_sleep(kMaxTimeout.count()); |
| PW_CHECK_UINT_EQ(TX_SUCCESS, result); |
| for_at_least -= kMaxTimeout; |
| } |
| const UINT result = tx_thread_sleep(for_at_least.count()); |
| PW_CHECK_UINT_EQ(TX_SUCCESS, result); |
| } |
| |
| } // namespace pw::this_thread |