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8b72a5736a
Adds thread identification, yield, and sleep support for embOS v4. Change-Id: I9ed552cf83035b4589740f88283b335194dcdc1a Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/36421 Reviewed-by: Ewout van Bekkum <ewout@google.com> Reviewed-by: Wyatt Hepler <hepler@google.com> Pigweed-Auto-Submit: Ewout van Bekkum <ewout@google.com> Commit-Queue: Ewout van Bekkum <ewout@google.com>
51 lines
1.6 KiB
C++
51 lines
1.6 KiB
C++
// Copyright 2021 The Pigweed Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy of
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// the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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#include "pw_thread/sleep.h"
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#include <algorithm>
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#include "RTOS.h"
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#include "pw_assert/assert.h"
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#include "pw_chrono/system_clock.h"
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#include "pw_chrono_embos/system_clock_constants.h"
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#include "pw_thread/id.h"
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using pw::chrono::embos::kMaxTimeout;
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namespace pw::this_thread {
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void sleep_for(chrono::SystemClock::duration for_at_least) {
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PW_DCHECK(get_id() != thread::Id());
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// Clamp negative durations to be 0 which maps to non-blocking.
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for_at_least = std::max(for_at_least, chrono::SystemClock::duration::zero());
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// The pw::sleep_{for,until} API contract is to yield if we attempt to sleep
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// for a duration of 0. The embOS delay does not explicitly yield if 0 is
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// passed, ergo we explicitly check for the yield condition.
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if (for_at_least == chrono::SystemClock::duration::zero()) {
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OS_Yield(); // Direct API is used to reduce overhead.
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return;
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}
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while (for_at_least > kMaxTimeout) {
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OS_Delay(kMaxTimeout.count());
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for_at_least -= kMaxTimeout;
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}
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OS_Delay(for_at_least.count());
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}
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} // namespace pw::this_thread
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