Bugfixes

* Queue now has a destroy() method
* Examples updated

README.md

@@ -2,26 +2,132 @@ noccylabs/ipc
 =============
 
 This is a one-size-fits-all IPC library to facilitate communication between
-threads and processes. It contains the following features:
+threads and processes. 
 
-**Core:**
+For complete examples, see the `examples` directory in the source tree.
+## Signals
 
- - [ ] Semaphore
+Asynchronous signals are automatically enabled if supported. Otherwise, the
- - [ ] Mutex
+`pcntl_signal_dispatch()` method must be frequently called from your main loop.
- - [x] Queue
+You can test for this using the `ASYNC_SIGNALS` constant:
- - [x] SharedMemory key-value store
- - [ ] SharedMemory blocks
- - [x] Signals
- - [x] Locks
 
-**High-Level:**
+    if (!ASYNC_SIGNALS) {
+        pcntl_signal_dispatch();
+    }
 
- - [ ] EventBridge
+### Signal handlers
- - [ ] EventDispatcher
- - [ ] InterOp/Marshalling
- - [x] Asynchronous timers
 
-**Transports:**
+Signal handlers allow for multiple listeners, with any one of them being able to
+prevent the signal from bubbling up.
 
- - [x] Stream channels
+    $handler = new SignalHandler(SIGUSR1);
 
+    $handler->addHandler(function () {
+        // Handle SIGUSR1, return true to stop bubbling
+        return true;
+    });
+
+You can also handle as well as fire signals using the `Signal` class:
+
+    $signal = new Signal(SIGUSR1);
+    $signal->setHandler(function () {
+        // Handle SIGUSR1
+    });
+
+    // Dispatch the signal to ourselves
+    (new Signal(SIGUSR1))->dispatch($pid);
+
+
+### Signal traps
+
+Traps are used in the main loop to break on signals
+
+    $trap = new SignalTrap(SIGINT);
+
+    while (!$trap->isTrapped()) {
+        // ...
+    }
+
+### Timers
+
+Timers fire asynchronously at fixed 1 second intervals. It requires signals to be
+processed; see above.
+
+    // Once every second...
+    $timer = new Timer(function () {
+        echo ".";
+    });
+
+## File locks
+
+File locks uses a shared file as a resource for locking.
+
+    // Creating the lock will not acquire it
+    $lock = new FileLock(__FILE__);
+
+    if (!$lock->acquire()) {
+        echo "fail!\n";
+    } else {
+        $lock->release();
+    }
+
+## SysV wrappers
+
+All these wrappers depend on a `KeyInterface` being passed to the constructor.
+This is usually an instance of a `FileKey`, created as such:
+
+    $key = new FileKey(__FILE__);
+
+The key has a project identifier that starts at `chr(0)`, or `"\0"`. To increase
+this identifier, and thus point to another segment, just clone it.
+
+    $key2 = clone $key1;
+
+### Semaphores
+
+### Mutexes
+
+### Message Queues
+
+    $key = new FileKey(__FILE__);
+    $msgq = new Queue($key);
+
+    $msgq->send(1, [ "Some data", [ "format"=>"foo" ]]);
+
+    $data = $msgq->receive(1, $type);
+
+    $msgq->destroy();
+
+### Shared Memory
+
+Shared memory using `SharedData` supports integrity checking when setting, using
+the third parameter to `set()`.
+
+    $key = new FileKey(__FILE__);
+    $shm = new SharedData($key);
+
+    do {
+        $counter = $shm->get("counter") + 1;
+    } while (!$shm->set("counter", $counter, true));
+
+    $shm->destroy();
+
+The `SharedMemory` class is a simple integer-indexed array
+
+    $key = new FileKey(__FILE__);
+    $shm = new SharedMemory($key);
+
+    $shm[0] = 42;    
+
+    $shm->destroy();
+
+## Communication
+
+### Channels
+
+Channels are essentially connected pipes. A channel can be created with a stream resource,
+or through the `createPair()` factory method.
+
+    [ $ch1, $ch2 ] = StreamChannel::createPair();
+    $ch1->send($data);
+    $rcvd = $ch2->receive();

composer.json

@@ -9,6 +9,12 @@
             "email": "cvagnetoft@gmail.com"
         }
     ],
+    "keywords": [
+        "ipc",
+        "shm",
+        "msgqueue",
+        "signals"
+    ],
     "require": {},
     "repositories": [
         {

examples/channels.php

@@ -0,0 +1,16 @@
+<?php
+
+require_once __DIR__."/../vendor/autoload.php";
+
+use NoccyLabs\Ipc\Interop\Channel\StreamChannel;
+
+// Create a pair of channels.
+[ $ch1, $ch2 ] = StreamChannel::createPair();
+
+// Send messages with send()
+$ch1->send([
+    'msg' => "Hello World"
+]);
+
+// Receive at the other end using receive()
+print_r($ch2->receive());

examples/locks.php

@@ -0,0 +1,43 @@
+<?php
+
+require_once __DIR__."/../vendor/autoload.php";
+
+use NoccyLabs\Ipc\Lock\FileLock;
+
+// Creating the lock will not acquire it
+$lock1 = new FileLock(__FILE__);
+$lock2 = new FileLock(__FILE__);
+
+// Acquire the lock like this
+if ($lock1->acquire()) {
+    echo "lock1 acquired\n";
+} else {
+    echo "lock1 not acquired\n";
+}
+
+// Test the locks like this
+if ($lock1->isLocked()) {
+    echo "lock1 is locked\n";
+} else {
+    echo "lock1 is not locked\n";
+}
+if ($lock2->isLocked()) {
+    echo "lock2 is locked\n";
+} else {
+    echo "lock2 is not locked\n";
+}
+
+// This will timeout after a second
+if ($lock2->acquire(1)) {
+    echo "lock2 acquired\n";
+} else {
+    echo "lock2 not acquired\n";
+}
+
+// After releasing, you can acquire it
+$lock1->release();
+if ($lock2->acquire(1)) {
+    echo "lock2 acquired\n";
+} else {
+    echo "lock2 not acquired\n";
+}

examples/queues.php

@@ -0,0 +1,26 @@
+<?php
+
+require_once __DIR__."/../vendor/autoload.php";
+
+use NoccyLabs\Ipc\Key\FileKey;
+use NoccyLabs\Ipc\Msg\Queue;
+
+$key = new FileKey(__FILE__);
+$msgq = new Queue($key);
+
+// Send packages with msgtype >= 1...
+$msgq->send(1, [ "what"=>"First" ]);
+$msgq->send(2, [ "what"=>"Second" ]);
+$msgq->send(3, [ "what"=>"Third" ]);
+
+// Read messages by requesting a type...
+$msg = $msgq->receive(2, $type);
+printf("msg: %s, type: %d\n", json_encode($msg), $type);
+
+// ...or read the first message with type 0...
+$msg = $msgq->receive(0, $type);
+printf("msg: %s, type: %d\n", json_encode($msg), $type);
+$msg = $msgq->receive(0, $type);
+printf("msg: %s, type: %d\n", json_encode($msg), $type);
+
+$msgq->destroy();

examples/shmdata.php

@@ -0,0 +1,35 @@
+<?php
+
+require_once __DIR__."/../vendor/autoload.php";
+
+use NoccyLabs\Ipc\Shm\SharedData;
+use NoccyLabs\Ipc\Key\FileKey;
+
+$key = new FileKey(__FILE__);
+$shm = new SharedData($key);
+
+// Set works as expected
+$shm->set("some.key", "Some value");
+// As does get
+echo $shm->get("some.key")."\n";
+
+// To make sure a value isn't modified while you are modifying it, use the third
+// parameter to set...
+//
+// Let's start at 123
+$shm->set("some.counter", 123);
+$counter = $shm->get("some.counter");
+echo "Counter is: ".$counter."\n";
+// And attempt to increase it
+$shm->set("some.counter", $counter + 1, true);
+$counter = $shm->get("some.counter");
+echo "Counter is: ".$counter."\n";
+
+// If the value is modified, the call will fail
+$shm2 = new SharedData($key);
+$shm2->set("some.counter", 345);
+if (!$shm->set("some.counter", $counter + 1, true)) {
+    echo "some.counter has been modified since last read\n";
+}
+
+$shm->destroy();

examples/signals.php

@@ -0,0 +1,29 @@
+<?php
+
+require_once __DIR__."/../vendor/autoload.php";
+
+use NoccyLabs\Ipc\Signal\SignalHandler;
+use NoccyLabs\Ipc\Signal\Signal;
+
+
+$handler = new SignalHandler(SIGUSR1);
+
+// Add handlers like this, or as an array passed as the second argument to the constructor
+$handler->addHandler(function () {
+    echo "First handler\n";
+});
+// If a handler returns true, it will prevent any further handlers from firing
+$handler->addHandler(function () {
+    echo "Second and final handler\n";
+    return true;
+});
+// Thus, this one will not be called
+$handler->addHandler(function() {
+    echo "Third handler, never called\n";
+});
+
+// Dispatch the signal to ourselves
+(new Signal(SIGUSR1))->dispatch(posix_getpid());
+// Default target of dispatch is the own pid
+(new Signal(SIGUSR1))->dispatch();
+    

examples/signaltraps.php

@@ -0,0 +1,16 @@
+<?php
+
+require_once __DIR__."/../vendor/autoload.php";
+
+use NoccyLabs\Ipc\Signal\SignalTrap;
+
+
+
+$trap = new SignalTrap(SIGINT);
+echo "Press ctrl-c...\n";
+
+while (!$trap->isTrapped()) {
+    usleep(10000);
+}
+
+echo "Thanks!\n";

src/Msg/Queue.php

@@ -32,6 +32,13 @@ class Queue
 
     }
 
+    public function destroy()
+    {
+        if ($this->resource) {
+            msg_remove_queue($this->resource);
+        }
+    }
+
     /**
      * Send to the queue
      *

src/Shm/SharedData.php

@@ -113,6 +113,7 @@ class SharedData extends SharedMemory
 
         // Update the data
         $this[self::IDX_DATA + $index] = [ md5($value), $value ];
+        $this->checks[$key] = md5($value);
         $this->unlock();
         return true;
     }

src/Signal/Signal.php

@@ -17,8 +17,8 @@ class Signal
         pcntl_signal($this->signo, $handler);
     }
 
-    public function dispatch($pid):bool
+    public function dispatch($pid=null):bool
     {
-        return posix_kill($pid, $this->signo);
+        return posix_kill($pid?:posix_getpid(), $this->signo);
     }
 }