109 lines
1.9 KiB
C++
109 lines
1.9 KiB
C++
#ifndef _library_workthread__hpp__included__
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#define _library_workthread__hpp__included__
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#include <cstdint>
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#include "threads.hpp"
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namespace workthread
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{
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class reflector;
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extern const uint32_t quit_request;
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/**
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* A worker thread.
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*
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* Note: All methods (except entrypoints) are thread-safe.
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*/
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class worker
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{
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public:
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/**
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* Constructor.
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*/
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worker();
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/**
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* Destructor.
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*/
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virtual ~worker();
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/**
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* Request quit. Sets quit request workflag.
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*/
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void request_quit();
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/**
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* Set the busy flag.
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*/
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void set_busy();
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/**
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* Clear the busy flag.
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*/
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void clear_busy();
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/**
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* Wait until busy flag cleared.
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*/
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void wait_busy();
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/**
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* Rethrow caught exception if any.
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*/
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void rethrow();
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/**
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* Set work flag.
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*
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* Parameter flag: The flags to set.
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*/
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void set_workflag(uint32_t flag);
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/**
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* Clear work flag.
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*
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* Parameter flag: Work flags to clear.
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* Returns: The workflags before clearing.
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*/
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uint32_t clear_workflag(uint32_t flag);
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/**
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* Wait until work flags nonzero.
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*
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* Returns: Current work flags.
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*/
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uint32_t wait_workflag();
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/**
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* Thread raw entrypoint.
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*
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* Note: Don't call from outside workthread code.
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*/
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int operator()(int dummy);
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/**
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* Get wait counters.
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*
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* Retrns: Two-element tuple.
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* - The first element is the amount of microseconds wait_busy() has waited.
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* - The second element is the amount of microseconds wait_workflag() has waited.
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*/
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std::pair<uint64_t, uint64_t> get_wait_count();
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protected:
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/**
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* Thread entrypoint.
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*
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* Notes: Exceptions thrown are catched.
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*/
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virtual void entry() = 0;
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/**
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* Start actually running the thread.
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*/
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void fire();
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private:
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threads::thread* thread;
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workthread::reflector* reflector;
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threads::cv condition;
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threads::lock mlock;
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volatile bool joined;
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volatile uint32_t workflag;
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volatile bool busy;
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volatile bool exception_caught;
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volatile bool exception_oom;
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volatile uint64_t waitamt_busy;
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volatile uint64_t waitamt_work;
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std::string exception_text;
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};
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}
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#endif
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