first initial update

README.md

@@ -0,0 +1,10 @@
+# linux cpp timeout package class
+
+it is use to check timeout in a task in linux c plus plus
+
+## how to use
+
+  1. `include "ctimeout.h"`
+  2. define object `CTimeOut timeout`
+  3. set the timeout whit time `timeout.set_timeout_msec(1000)`
+  4. then you can check if the time in your task is timeout you can use `timeout.is_timeout()`to get a bool return to confirm it

timeout_test/Makefile

@@ -0,0 +1,13 @@
+object = main.o ctimeout.o
+run_target = timeout_test
+LFLAG = 
+
+main : $(object)
+	g++ -o $(run_target) $(object) $(LFLAG)
+
+main.o : main.cpp
+ctimeout.o : ctimeout.h ctimeout.cpp
+
+.PHONY : clean
+clean:
+	rm $(object) 

timeout_test/ctimeout.cpp

@@ -0,0 +1,43 @@
+#include "ctimeout.h"
+
+int CTimeOut::set_timeout_msec(int msec)
+{
+    if (msec <= 0) {
+        return 1;
+    }
+
+    gettimeofday(&timeout_set, NULL);
+    
+    // 分解设置的毫秒数
+    long usec2add = (msec & 1000) * 1000;
+    int sec2add = (msec / 1000); 
+    
+    // 算出加上超时时间后的微秒数和秒数
+    long real_usec = (timeout_set.tv_usec + usec2add) % 1000000;
+    int real_sec = ((timeout_set.tv_usec + usec2add) / 1000000) + sec2add + timeout_set.tv_sec;
+
+    // 设置超时的时间
+    timeout_set.tv_sec = real_sec;
+    timeout_set.tv_usec = real_usec;
+
+    return 0;
+}
+
+int CTimeOut::set_timeout_sec(int sec)
+{
+    if (sec <= 0) {
+        return 1;
+    }
+
+    gettimeofday(&timeout_set, NULL);
+
+    timeout_set.tv_sec += sec;
+
+    return 0;
+}
+
+bool CTimeOut::is_timeout()
+{
+    gettimeofday(&timeout_now, NULL);
+    return timeout_now.tv_sec >= timeout_set.tv_sec && timeout_now.tv_usec >= timeout_set.tv_usec;
+}

timeout_test/ctimeout.h

@@ -0,0 +1,19 @@
+#ifndef _TIMEOUT_H_
+#define _TIMEOUT_H_
+
+#include <sys/time.h>
+#include <unistd.h>
+
+class CTimeOut
+{
+public:
+    int set_timeout_msec(int msec);
+    int set_timeout_sec(int sec);
+    bool is_timeout();
+
+private:
+    timeval timeout_set;
+    timeval timeout_now;
+};
+
+#endif

timeout_test/main.cpp

@@ -0,0 +1,20 @@
+#include "ctimeout.h"
+#include <iostream>
+
+using namespace std;
+
+int main(int argc, char **argv)
+{
+    CTimeOut timeout;
+    int i = 0;
+
+    timeout.set_timeout_msec(500);
+    while (1) {
+        if (timeout.is_timeout()) {
+            cout << "i = " << i++ << endl;
+            timeout.set_timeout_msec(500);
+        }
+    }
+    
+    return 0;
+}