added posix thread example

CPP/multithreading/Makefile

@@ -0,0 +1,29 @@
+cpp_src = $(wildcard *.cpp) 
+cpp_src += $(wildcard ./utils/*.cpp)
+cpp_src += $(wildcard ./driver/*.cpp)
+
+cpp_obj = $(cpp_src:.cpp=.o)
+c_obj = $(c_src:.c=.o)
+CC = g++ 
+CFLAGS = -Wall -pedantic -li2c 
+LDFLAGS = -lpthread
+EXEC = runtest
+
+
+all : $(EXEC)
+
+$(EXEC): $(cpp_obj) $(c_obj)
+	$(CC) -o $@ $^ $(LDFLAGS) 
+
+debug : $(EXEC)
+
+$(EXEC): $(cpp_obj) $(c_obj)
+	$(CC) -g -o $@ $^ $(LDFLAGS) 
+
+clean: 
+	rm -rf $(c_obj) $(cpp_obj) $(EXEC)
+	clear
+
+cleanall: 
+	rm -rf $(c_obj) $(cpp_obj) $(EXEC)
+	clear

CPP/multithreading/main.cpp

@@ -0,0 +1,77 @@
+#include <iostream>
+
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string>
+
+pthread_mutex_t print_mtx;
+
+class IThread
+{
+    public:
+
+    private:
+
+    virtual void* _run() = 0;
+
+    static void* _staticRun(void* context)
+    {
+        return static_cast<IThread*>(context)->_run();
+    }
+};
+
+
+
+void printer(std::string a)
+{
+    pthread_mutex_lock(&print_mtx);
+
+    std::cout << a << std::endl;
+
+    pthread_mutex_unlock(&print_mtx);
+}
+
+void* foo(void* arg)
+{
+    unsigned int i = 100;
+    for(;i >  0; i--){
+        std::string a = "foo cnt: ";
+        a += std::to_string(i);
+        printer(a);
+        sleep(1);
+    }
+
+}
+
+void* baa(void* arg)
+{
+    unsigned int i = 5;
+    
+    for(;i >  0; i--){
+        std::string a = "baa cnt: ";
+        a += std::to_string(i);
+        printer(a);
+        sleep(10);
+    }
+}
+
+int main()
+{
+    pthread_t foo_th, baa_th;
+    
+
+    pthread_mutex_init(&print_mtx, NULL);
+
+    pthread_create(&foo_th, NULL, foo, NULL);
+    pthread_create(&baa_th, NULL, baa, NULL);
+
+
+    pthread_join(foo_th, NULL);
+    pthread_join(baa_th, NULL);
+    
+    
+    return 0;
+}
+