Add debugger code sample - Fib (#1383)

Add debugger code sample - Fib

Author: pieandcakes

Code Samples/Fib/.vscode/launch.json

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+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "(gdb) Launch",
+            "preLaunchTask": "build",
+            "type": "cppdbg",
+            "request": "launch",
+            "args": [],
+            "stopAtEntry": true,
+            "cwd": "${workspaceRoot}",
+            "environment": [],
+            "externalConsole": true,
+            "setupCommands": [
+                {
+                    "description": "Enable pretty-printing for gdb",
+                    "text": "-enable-pretty-printing",
+                    "ignoreFailures": true
+                }
+            ],
+            "logging": {
+                "engineLogging": false,
+                "trace": false
+            },
+            "windows": {
+                "program": "${workspaceRoot}/fib.exe",
+                "MIMode": "gdb",
+                "miDebuggerPath": "<Path/To/GDB>" // Path to gdb on windows
+            },
+            "linux": {
+                "program": "${workspaceRoot}/fib.out",
+                "MIMode": "gdb"
+            },
+            "osx": {
+                "program": "${workspaceRoot}/fib.out",
+                "MIMode": "lldb"
+            }
+        }
+    ]
+}

Code Samples/Fib/.vscode/tasks.json

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+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "taskName": "build",
+            "type": "shell",
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            },
+            "presentation": {
+                "echo": true,
+                "reveal": "always",
+                "focus": false,
+                "panel": "shared"
+            },
+            "windows": {
+                "command": "${workspaceRoot}/build.cmd",
+                "args": [
+                    "<Path/To/MinGW/Cygwin/Bin/Folder>",    // Path to the bin folder containing g++ to compile
+                    "fib.exe"                               // Output executable name
+                ]
+            },
+            "linux": {
+                "command": "g++",
+                "args": [
+                    "-g",
+                    "*.cpp",
+                    "-lpthread",
+                    "--std=c++11",
+                    "-o",
+                    "fib.out"
+                ]
+            },
+            "osx": {
+                "command": "g++",
+                "args": [
+                    "-g",
+                    "*.cpp",
+                    "-lpthread",
+                    "--std=c++11",
+                    "-o",
+                    "fib.out"
+                ]
+            }
+        }
+    ]
+}

Code Samples/Fib/README.md

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+# Fib
+
+This code sample is to show debugging. Update `launch.json` and `tasks.json` in the `.vscode` folder to use your setup to build and debug. 

Code Samples/Fib/build.cmd

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+SET PATH=%PATH%;%1
+g++ -g *.cpp -lpthread --std=c++11 -O0 -o %2

Code Samples/Fib/main.cpp

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+#include <iostream>
+#include <unistd.h>
+#include <sys/types.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+
+#include "thread.h"
+
+#define THREAD_COUNT 10
+
+static char block[] = "--block";
+int test = 0;
+
+int main(int argc, char **argv)
+{
+    srand(time(NULL));
+
+    static char pidText[] = "PID: ";
+    std::string helpText = "Attach a debugger and execute 'set foo=0' to continue";
+    char helloText[] = "Hello World!";
+
+    std::cout << helloText << std::endl;
+
+    pthread_t threads[THREAD_COUNT];
+
+    if (argc == 2 && !strcmp(block, argv[1]))
+    {
+        std::cout << helpText << std::endl;
+        volatile int foo = 1;
+        while (foo)
+            ;
+    }
+
+    if (argc == 2 && !strcmp("--crash", argv[1]))
+    {
+        int foo = 0;
+        int bar = 1 / foo;
+    }
+
+    for (int i = 0; i < THREAD_COUNT; i++)
+    {
+        std::cout << "Test " << i << std::endl;
+        pthread_create(&threads[i], NULL, &thread_proc, NULL);
+    }
+
+    for (int i = 0; i < THREAD_COUNT; i++)
+    {
+        pthread_join(threads[i], NULL);
+        test++;
+    }
+
+    std::cout << "All threads exited!" << std::endl;
+
+    return 1;
+}

Code Samples/Fib/thread.cpp

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+#include <iostream>
+#include <unistd.h>
+#include <sys/types.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+
+#include "thread.h"
+
+static int g_tid = 0;
+
+static int fib(int n){
+    switch (n) {
+        case 0: return 1;
+        case 1: return 1;
+        default: return (fib(n-2) + fib(n-1)); 
+    }    
+}
+
+void * thread_proc(void* ctx)
+{
+    int tid = g_tid++;
+    
+    char thread_name[16];
+    sprintf(thread_name, "Thread %d", tid);
+#ifdef __APPLE__
+    pthread_setname_np(thread_name);
+#else
+    pthread_setname_np(pthread_self(), thread_name);
+#endif
+    
+    // Random delay, 0 - 0.5 sec
+    timespec ts;
+    ts.tv_sec = 0;
+    ts.tv_nsec = 500000000 + ((float)rand() / (float)RAND_MAX) * 500000000;
+    nanosleep(&ts, NULL);
+    
+    volatile int i = 0;
+    while (i <= 30) {
+        std::cout << "Thread " << tid << ": fib(" << i << ") = " << fib(i) << std::endl;
+        i++;
+        nanosleep(&ts, NULL);
+    }
+    
+    std::cout << thread_name << " exited!" << std::endl;
+}

Code Samples/Fib/thread.h

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+void * thread_proc(void* ctx);