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https://fuchsia.googlesource.com/third_party/pigweed.googlesource.com/pigweed/pigweed
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f7e38b3ec3
Adds initial ThreadX support through a set of backends for pw_sync through pw_sync_threadx and pw_chrono through pw_chrono_threadx. Change-Id: I3e310323cfce3d4bf07557273c2a86f91f6479d7 Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/24900 Reviewed-by: Wyatt Hepler <hepler@google.com> Commit-Queue: Ewout van Bekkum <ewout@google.com>
54 lines
1.6 KiB
C++
54 lines
1.6 KiB
C++
// Copyright 2020 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_sync/mutex.h"
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#include <algorithm>
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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_threadx/system_clock_constants.h"
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#include "pw_interrupt/context.h"
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#include "tx_api.h"
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using pw::chrono::SystemClock;
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using pw::chrono::threadx::kMaxTimeout;
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namespace pw::sync {
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bool Mutex::try_lock_for(SystemClock::duration for_at_least) {
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// Enforce the pw::sync::Mutex IRQ contract.
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PW_DCHECK(!interrupt::InInterruptContext());
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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, SystemClock::duration::zero());
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while (for_at_least > kMaxTimeout) {
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const UINT result = tx_mutex_get(&native_type_, kMaxTimeout.count());
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if (result != TX_NOT_AVAILABLE) {
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PW_CHECK_UINT_EQ(TX_SUCCESS, result);
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return true;
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}
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for_at_least -= kMaxTimeout;
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}
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const UINT result = tx_mutex_get(&native_type_, for_at_least.count());
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if (result == TX_NOT_AVAILABLE) {
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return false;
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}
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PW_CHECK_UINT_EQ(TX_SUCCESS, result);
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return true;
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}
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} // namespace pw::sync
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