From 5bb28835d06e27dbd960916c9fb11a555fc5a9bc Mon Sep 17 00:00:00 2001
From: lichao <lichao@aiotlink.com>
Date: 星期一, 26 四月 2021 14:24:29 +0800
Subject: [PATCH] add shared lib target.
---
src/shm.cpp | 100 +++++++++++++++++++++----------------------------
1 files changed, 43 insertions(+), 57 deletions(-)
diff --git a/src/shm.cpp b/src/shm.cpp
index f052477..6d7dccd 100644
--- a/src/shm.cpp
+++ b/src/shm.cpp
@@ -10,74 +10,60 @@
* Revision: none
* Compiler: gcc
*
- * Author: YOUR NAME (),
+ * Author: Li Chao (),
* Organization:
*
* =====================================================================================
*/
+
#include "shm.h"
-#include "bh_util.h"
-#include <mutex>
-namespace bhome_shm {
-using namespace boost::interprocess;
-
-namespace {
-std::string MsgQIdToName(const int id) { return "shmq" + std::to_string(id); }
-}
-
-ShmMsgQueue::ShmMsgQueue(MQId id, ShmType &segment, const std::string &name, const uint32_t len):
-SharedQueue(segment, name, id, len, segment.get_segment_manager())
-{
- printf("queue size: %ld cap: %ld\n", data()->size(), data()->capacity());
-}
-
-ShmMsgQueue::ShmMsgQueue(MQId id, ShmType &segment, const uint32_t len):
-ShmMsgQueue(id, segment, MsgQIdToName(id), len)
-{}
-
-ShmMsgQueue::~ShmMsgQueue()
+namespace bhome_shm
{
-}
-
-bool ShmMsgQueue::Send(MQId remote_id, const void *data, const size_t size, const int timeout_ms)
+bool MutexWithTimeLimit::try_lock()
{
- if (data && size) {
- Queue *remote = find(MsgQIdToName(remote_id));
- if (remote) {
- void *p = shm().allocate(size, std::nothrow);
- bool r = false;
- if (p) {
- Msg buf = { id(), p, size};
- memcpy(p, data, size);
- if (remote->Write(buf, timeout_ms)) {
- return true;
- } else {
- shm().deallocate(p);
- }
- }
- }
- }
- return false;
+ if (mutex_.try_lock()) {
+ auto old_time = last_lock_time_.load();
+ if (Now() - old_time > limit_) {
+ return last_lock_time_.compare_exchange_strong(old_time, Now());
+ } else {
+ last_lock_time_.store(Now());
+ return true;
+ }
+ } else {
+ auto old_time = last_lock_time_.load();
+ if (Now() - old_time > limit_) {
+ return last_lock_time_.compare_exchange_strong(old_time, Now());
+ } else {
+ return false;
+ }
+ }
}
-
-bool ShmMsgQueue::Recv(MQId &source_id, void *&data, size_t &size, const int timeout_ms)
+void MutexWithTimeLimit::lock()
{
- Msg buf;
- if (Read(buf, timeout_ms) && buf.size_ > 0) {
- DEFER1(shm().deallocate(buf.data_.get()););
- source_id = buf.src_;
- size = buf.size_;
- if (data = malloc(size)) {
- memcpy(data, buf.data_.get(), size);
- return true;
- }
- }
- source_id = 0;
- data = 0;
- size = 0;
- return false;
+ while (!try_lock()) {
+ std::this_thread::yield();
+ }
+}
+void MutexWithTimeLimit::unlock()
+{
+ auto old_time = last_lock_time_.load();
+ if (Now() - old_time > limit_) {
+ } else {
+ if (last_lock_time_.compare_exchange_strong(old_time, Now())) {
+ mutex_.unlock();
+ }
+ }
}
+SharedMemory::SharedMemory(const std::string &name, const uint64_t size) :
+ mshm_t(open_or_create, name.c_str(), size, 0, AllowAll()),
+ name_(name)
+{
+}
+
+SharedMemory::~SharedMemory()
+{
+}
} // namespace bhome_shm
--
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