108 lines
3.1 KiB
C
108 lines
3.1 KiB
C
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/*
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* Copyright (c) 2021 Huawei Device Co., Ltd.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// utils for multi-thread and multi-process test
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#ifndef KERNEL_LITE_MT_UTILS
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#define KERNEL_LITE_MT_UTILS
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#include <stdint.h>
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// count all primes numbers below 'maxNumber', used for keep cpu busy
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int CountPrimes(uint32_t maxNumber);
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/**
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* desc: keep cpu run for 'ms' miliseconds, without any syscall or pend operation
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* input: miliseconds value, only some specific value is supported, as below:
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* -- 10, 20, 30, 60, 100, 150, 200, 300, 400, 600, 1000, 2000
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* output: useless, only used for avoid the whole function is optimized by gcc
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* note: the actual elasped time is not so accurate
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*/
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int BusyRun(uint32_t ms);
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/**
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* desc: used for check if the code is runned as expected, in multi-thread or multi-process scenario
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* input: step -- from 1 to 15(0xf).
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* output: the actual steps the this function is called.
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Example:
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LOG("step=%lx", CheckStep(1)); // may called in thread 1
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LOG("step=%lx", CheckStep(2)); // may called in thread 2
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LOG("step=%lx", CheckStep(3)); // may called in thread 3
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LOG("step=%lx", CheckStep(4)); // may called in thread 2
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uint64_t step = CheckStep(5); // may called in thread 1
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if (step == 0x12345) {
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LOG("everything is ok");
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} else {
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LOG("code not run as expected!");
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}
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Output:
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step=1
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step=12
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step=123
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step=1234
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everything is ok
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*/
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uint64_t CheckStep(int step);
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/**
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* desc: used for synchronize in multi-process scenario, not suitable for multi-thread.
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* usage:
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InitPipe();
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fork();
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if parent:
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...
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BlockOnPipe(); // will block until UnBlockPipe is called in another process.
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...
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if child:
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...
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UnBlockPipe();
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...
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*/
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// return -1 if pipe-init failed, user should check return code
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int InitPipe();
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void BlockOnPipe();
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void UnBlockPipe();
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/**
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* desc: get and set a global variable, can be used in multi-process scenario
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* usage:
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* InitGlobalVariable();
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* fork();
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* if child:
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* ...
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* SetGlobalVariable(x);
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* ...
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* if parent:
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* ...
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* SetGlobalVariable(y);
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* ...
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* int i = GetGlobalVariable();
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* // check if i is ok
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* ...
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* DeleteGlobalVariable(); // Call before exit
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* exit...
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*/
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// output: return -1 if the operation fails, user should check return code
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int InitGlobalVariable();
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// return -1 if the operation fails
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int SetGlobalVariable(int value);
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// return -1 if the operation fails.
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int GetGlobalVariable();
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// return -1 if the operation fails
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int DeleteGlobalVariable();
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#endif
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