Basic Header file ready

.gitignore

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+*.sln
+*.vcxproj
+*.vcxproj.filters
+*.vcxproj.user
+x64
+.vs
+build
+.vscode

CMakeLists.txt

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+# CMakeList.txt : CMake project for Event Loop ( Async Programming ), include source and define
+# project specific logic here.
+#
+cmake_minimum_required (VERSION 3.8)
+
+project(Event-Loop VERSION 1.0.0 LANGUAGES C CXX)
+
+set(CMAKE_C_STANDARD          17)
+set(CMAKE_C_STANDARD_REQUIRED ON)
+set(CMAKE_C_EXTENSIONS        OFF)
+
+
+#Output file structure
+
+#Scheme 1
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin/$<CONFIG>")
+set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib/$<CONFIG>")
+set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib/$<CONFIG>")
+
+#Scheme 2
+#set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/$<CONFIG>/bin")
+#set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/$<CONFIG>/lib")
+#set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/$<CONFIG>/lib")
+
+#Library Name...
+set(EVENT_LOOP_LIB evloop)
+
+
+#Header file directory...
+set(HEADER_DIR ${CMAKE_SOURCE_DIR}/include)
+
+#Source file directory...
+set(SOURCE_DIR ${CMAKE_SOURCE_DIR}/src)
+
+#Adding Sub-directory having CMakeLists.txt...
+add_subdirectory(src)
+#add_subdirectory(test)

CMakePresets.json

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+{
+    "version": 3,
+    "configurePresets": [
+        {
+            "name": "windows-base",
+            "hidden": true,
+            "generator": "Ninja",
+            "binaryDir": "${sourceDir}/out/build/${presetName}",
+            "installDir": "${sourceDir}/out/install/${presetName}",
+            "cacheVariables": {
+                "CMAKE_C_COMPILER": "cl.exe",
+                "CMAKE_CXX_COMPILER": "cl.exe"
+            },
+            "condition": {
+                "type": "equals",
+                "lhs": "${hostSystemName}",
+                "rhs": "Windows"
+            }
+        },
+        {
+            "name": "x64-debug",
+            "displayName": "x64 Debug",
+            "inherits": "windows-base",
+            "architecture": {
+                "value": "x64",
+                "strategy": "external"
+            },
+            "cacheVariables": {
+                "CMAKE_BUILD_TYPE": "Debug"
+            }
+        },
+        {
+            "name": "x64-release",
+            "displayName": "x64 Release",
+            "inherits": "x64-debug",
+            "cacheVariables": {
+                "CMAKE_BUILD_TYPE": "Release"
+            }
+        },
+        {
+            "name": "x86-debug",
+            "displayName": "x86 Debug",
+            "inherits": "windows-base",
+            "architecture": {
+                "value": "x86",
+                "strategy": "external"
+            },
+            "cacheVariables": {
+                "CMAKE_BUILD_TYPE": "Debug"
+            }
+        },
+        {
+            "name": "x86-release",
+            "displayName": "x86 Release",
+            "inherits": "x86-debug",
+            "cacheVariables": {
+                "CMAKE_BUILD_TYPE": "Release"
+            }
+        },
+        {
+            "name": "linux-debug",
+            "displayName": "Linux Debug",
+            "generator": "Ninja",
+            "binaryDir": "${sourceDir}/out/build/${presetName}",
+            "installDir": "${sourceDir}/out/install/${presetName}",
+            "cacheVariables": {
+                "CMAKE_BUILD_TYPE": "Debug"
+            },
+            "condition": {
+                "type": "equals",
+                "lhs": "${hostSystemName}",
+                "rhs": "Linux"
+            },
+            "vendor": {
+                "microsoft.com/VisualStudioRemoteSettings/CMake/1.0": {
+                    "sourceDir": "$env{HOME}/.vs/$ms{projectDirName}"
+                }
+            }
+        },
+        {
+            "name": "macos-debug",
+            "displayName": "macOS Debug",
+            "generator": "Ninja",
+            "binaryDir": "${sourceDir}/out/build/${presetName}",
+            "installDir": "${sourceDir}/out/install/${presetName}",
+            "cacheVariables": {
+                "CMAKE_BUILD_TYPE": "Debug"
+            },
+            "condition": {
+                "type": "equals",
+                "lhs": "${hostSystemName}",
+                "rhs": "Darwin"
+            },
+            "vendor": {
+                "microsoft.com/VisualStudioRemoteSettings/CMake/1.0": {
+                    "sourceDir": "$env{HOME}/.vs/$ms{projectDirName}"
+                }
+            }
+        }
+    ]
+}

README.md

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+# Event-Loop-in-C

include/event_loop.h

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+#ifndef __EV_LOOP__
+#define __EV_LOOP__
+
+
+typedef struct task_ task_t;
+typedef struct event_loop_ event_loop_t;
+
+typedef EL_RES_T(*event_cbk)(void*);
+
+struct task_ {
+
+    event_cbk cbk;
+    void* arg;
+    struct task_* left, * right;
+};
+
+typedef enum {
+
+    EV_LOOP_IDLE,
+    EV_LOOP_BUSY
+} EV_LOOP_STATE;
+
+struct event_loop_ {
+
+    /* head to the start of the task array */
+    struct task_* task_array_head[TASK_PRIORITY_MAX];
+    /* Mutex to enforce Mutual exclusion enqueue/Deque
+     * Operation in task array. Also used to update event loop
+     * attributes in mutual exclusive way
+     */
+    pthread_mutex_t ev_loop_mutex;
+    /* State of event loop */
+    EV_LOOP_STATE ev_loop_state;
+    /* CV to suspened event loop thread */
+    pthread_cond_t ev_loop_cv;
+    /*  Event loop thread */
+    pthread_t* thread;
+    /* Current task which event loop thread is executing.
+     * NULL if event loop is resting in peace*/
+    struct task_* current_task;
+};
+
+#endif

src/CMakeLists.txt

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+set(EVENT_LOOP_SRC "event_loop.c")
+
+add_library(${EVENT_LOOP_LIB} STATIC
+					${EVENT_LOOP_SRC})
+
+target_include_directories(${EVENT_LOOP_LIB} PUBLIC
+								${HEADER_DIR})