From 58d904a328c0d849769b483e901a0be9426b8209 Mon Sep 17 00:00:00 2001
From: liuxiaolong <liuxiaolong@aiotlink.com>
Date: 星期二, 20 七月 2021 20:20:44 +0800
Subject: [PATCH] 调整Request C.BHFree的位置
---
src/robust.h | 283 ++++++++++----------------------------------------------
1 files changed, 50 insertions(+), 233 deletions(-)
diff --git a/src/robust.h b/src/robust.h
index 983567f..255aea4 100644
--- a/src/robust.h
+++ b/src/robust.h
@@ -19,257 +19,74 @@
#ifndef ROBUST_Q31RCWYU
#define ROBUST_Q31RCWYU
+#include "bh_util.h"
+#include "log.h"
+#include <string.h>
#include <atomic>
#include <chrono>
-#include <memory>
-#include <string.h>
-#include <string>
-#include <sys/types.h>
#include <unistd.h>
namespace robust
{
-using namespace std::chrono;
-using namespace std::chrono_literals;
-constexpr uint64_t MaskBits(int nbits) { return (uint64_t(1) << nbits) - 1; }
-
-void QuickSleep();
-
-class RobustReqRep
+// atomic queue, length is 1.
+// lowest bit is used for data flag, 63 bit for data.
+class AtomicQ63
{
- typedef uint32_t State;
- typedef std::string Msg;
- typedef std::chrono::steady_clock::duration Duration;
-
public:
- enum ErrorCode {
- eSuccess = 0,
- eTimeout = EAGAIN,
- eSizeError = EINVAL,
- };
-
- explicit RobustReqRep(const uint32_t max_len) :
- capacity_(max_len), state_(eStateInit), timestamp_(Duration(0)), size_(0) {}
-
- void PutReady() { state_.store(eStateReady); }
- bool Ready() const { return state_.load() == eStateReady; }
- uint32_t capacity() const { return capacity_; }
-
- int ClientRequest(const Msg &request, Msg &reply)
+ typedef int64_t Data;
+ AtomicQ63() { memset(this, 0, sizeof(*this)); }
+ bool push(const Data d, bool try_more = false)
{
- int r = ClientWriteRequest(request);
- if (r == eSuccess) {
- r = ClientReadReply(reply);
- }
+ auto cur = buf.load();
+ return Empty(cur) && buf.compare_exchange_strong(cur, Enc(d));
+ }
+ bool pop(Data &d, bool try_more = false)
+ {
+ Data cur = buf.load();
+ bool r = !Empty(cur) && buf.compare_exchange_strong(cur, 0);
+ if (r) { d = Dec(cur); }
return r;
}
- int ClientReadReply(Msg &reply);
- int ClientWriteRequest(const Msg &request);
- int ServerReadRequest(Msg &request);
- int ServerWriteReply(const Msg &reply);
private:
- RobustReqRep(const RobustReqRep &);
- RobustReqRep(RobustReqRep &&);
- RobustReqRep &operator=(const RobustReqRep &) = delete;
- RobustReqRep &operator=(RobustReqRep &&) = delete;
+ static inline bool Empty(const Data d) { return (d & 1) == 0; } // lowest bit 1 means data ok.
+ static inline Data Enc(const Data d) { return (d << 1) | 1; } // lowest bit 1 means data ok.
+ static inline Data Dec(const Data d) { return d >> 1; } // lowest bit 1 means data ok.
- enum {
- eStateInit = 0,
- eStateReady = 0x19833891,
- eClientWriteBegin,
- eClientWriteEnd,
- eServerReadBegin,
- eServerReadEnd,
- eServerWriteBegin,
- eServerWriteEnd,
- eClientReadBegin,
- eClientReadEnd = eStateReady,
+ typedef std::atomic<Data> AData;
+ // static_assert(sizeof(Data) == sizeof(AData));
+
+ AData buf;
+};
+
+// atomic request-reply process, one cycle a time.
+class AtomicReqRep
+{
+public:
+ typedef int64_t Data;
+ typedef std::function<Data(const Data)> Handler;
+ bool ClientRequest(const Data request, Data &reply);
+ bool ServerProcess(Handler onReq);
+ AtomicReqRep() :
+ data_(0), timestamp_(now()) {}
+
+private:
+ enum State {
+ eStateFree,
+ eStateRequest,
+ eStateReply
};
- bool StateCas(State exp, State val);
- void Write(const Msg &msg)
- {
- size_.store(msg.size());
- memcpy(buf, msg.data(), msg.size());
- }
- void Read(Msg &msg) { msg.assign(buf, size_.load()); }
+ static int GetState(Data d) { return d & MaskBits(3); }
+ static Data Encode(Data d, State st) { return (d << 3) | st; }
+ static Data Decode(Data d) { return d >> 3; }
+ typedef std::chrono::steady_clock steady_clock;
+ typedef steady_clock::duration Duration;
+ static Duration now() { return steady_clock::now().time_since_epoch(); }
- const uint32_t capacity_;
- std::atomic<State> state_;
- static_assert(sizeof(State) == sizeof(state_), "atomic should has no extra data.");
+ bool DataCas(Data expected, Data val) { return data_.compare_exchange_strong(expected, val); }
+ std::atomic<Data> data_;
std::atomic<Duration> timestamp_;
- std::atomic<int32_t> size_;
- char buf[4];
-};
-
-class PidLocker
-{
-public:
- typedef int locker_t;
- static locker_t this_locker()
- {
- static locker_t val = getpid();
- return val;
- }
- static bool is_alive(locker_t locker) { return true; }
-};
-
-class RobustPidLocker
-{
-public:
- typedef int locker_t;
- static locker_t this_locker()
- {
- static locker_t val = getpid();
- return val;
- }
- static bool is_alive(locker_t locker)
- {
- char buf[64] = {0};
- snprintf(buf, sizeof(buf) - 1, "/proc/%d/stat", locker);
- return access(buf, F_OK) == 0;
- }
-};
-
-template <class LockerT>
-class CasMutex
-{
- typedef typename LockerT::locker_t locker_t;
- static inline locker_t this_locker() { return LockerT::this_locker(); }
- static inline bool is_alive(locker_t locker) { return LockerT::is_alive(locker); }
-
-public:
- CasMutex() :
- meta_(0) {}
- int try_lock()
- {
- const auto t = steady_clock::now().time_since_epoch().count();
- auto old = meta_.load();
- int r = 0;
- if (!Locked(old)) {
- r = MetaCas(old, Meta(1, this_locker()));
- } else if (!is_alive(Locker(old))) {
- r = static_cast<int>(MetaCas(old, Meta(1, this_locker()))) << 1;
- if (r) {
- printf("captured pid %d -> %d, r = %d\n", Locker(old), this_locker(), r);
- }
- }
- return r;
- }
- int lock()
- {
- int r = 0;
- do {
- r = try_lock();
- } while (r == 0);
- return r;
- }
- void unlock()
- {
- auto old = meta_.load();
- if (Locked(old) && Locker(old) == this_locker()) {
- MetaCas(old, Meta(0, this_locker()));
- }
- }
-
-private:
- static_assert(sizeof(locker_t) < sizeof(uint64_t), "locker size must be smaller than 64 bit!");
- std::atomic<uint64_t> meta_;
- bool Locked(uint64_t meta) { return (meta >> 63) != 0; }
- locker_t Locker(uint64_t meta) { return meta & MaskBits(sizeof(locker_t) * 8); }
- uint64_t Meta(uint64_t lk, locker_t lid) { return (lk << 63) | lid; }
- bool MetaCas(uint64_t exp, uint64_t val) { return meta_.compare_exchange_strong(exp, val); }
-};
-
-typedef CasMutex<RobustPidLocker> Mutex;
-
-template <class Lock>
-class Guard
-{
-public:
- Guard(Lock &l) :
- l_(l) { l_.lock(); }
- ~Guard() { l_.unlock(); }
-
-private:
- Guard(const Guard &);
- Guard(Guard &&);
- Lock &l_;
-};
-
-template <class D, class Alloc = std::allocator<D>>
-class CircularBuffer
-{
- typedef uint32_t size_type;
- typedef uint32_t count_type;
- typedef uint64_t meta_type;
- static size_type Pos(meta_type meta) { return meta & 0xFFFFFFFF; }
- static count_type Count(meta_type meta) { return meta >> 32; }
- static size_type Meta(meta_type count, size_type pos) { return (count << 32) | pos; }
-
-public:
- typedef D Data;
-
- CircularBuffer(const size_type cap) :
- CircularBuffer(cap, Alloc()) {}
- CircularBuffer(const size_type cap, Alloc const &al) :
- state_(0), capacity_(cap), mhead_(0), mtail_(0), al_(al), buf(al_.allocate(cap))
- {
- if (!buf) {
- throw("robust CircularBuffer allocate error: alloc buffer failed, out of mem!");
- }
- }
- ~CircularBuffer() { al_.deallocate(buf, capacity_); }
-
- size_type size() const { return (capacity_ + tail() - head()) % capacity_; }
- bool full() const { return (capacity_ + tail() + 1 - head()) % capacity_ == 0; }
- bool empty() const { return head() == tail(); }
- bool push_back(Data d)
- {
- Guard<Mutex> guard(mutex_);
- if (!full()) {
- auto old = mtail();
- buf[Pos(old)] = d;
- return mtail_.compare_exchange_strong(old, next(old));
- } else {
- return false;
- }
- }
- bool pop_front(Data &d)
- {
- Guard<Mutex> guard(mutex_);
- if (!empty()) {
- auto old = mhead();
- d = buf[Pos(old)];
- return mhead_.compare_exchange_strong(old, next(old));
- } else {
- return false;
- }
- }
- bool Ready() const { return state_.load() == eStateReady; }
- void PutReady() { state_.store(eStateReady); }
-
-private:
- CircularBuffer(const CircularBuffer &);
- CircularBuffer(CircularBuffer &&);
- CircularBuffer &operator=(const CircularBuffer &) = delete;
- CircularBuffer &operator=(CircularBuffer &&) = delete;
-
- meta_type next(meta_type meta) const { return Meta(Count(meta) + 1, (Pos(meta) + 1) % capacity_); }
- size_type head() const { return Pos(mhead()); }
- size_type tail() const { return Pos(mtail()); }
- meta_type mhead() const { return mhead_.load(); }
- meta_type mtail() const { return mtail_.load(); }
- // data
- enum { eStateReady = 0x19833891 };
- std::atomic<uint32_t> state_;
- const size_type capacity_;
- Mutex mutex_;
- std::atomic<meta_type> mhead_;
- std::atomic<meta_type> mtail_;
- Alloc al_;
- typename Alloc::pointer buf = nullptr;
};
} // namespace robust
--
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