What is the use of WaitForSingleObject?
The WaitForSingleObject function checks the current state of the specified object. If the object’s state is nonsignaled, the calling thread enters the wait state until the object is signaled or the time-out interval elapses. The function modifies the state of some types of synchronization objects.
Is Postmessage thread safe?
Show activity on this post. SendMessage and SendMessageTimeout are blocking functions: They pause the sender until the receiver has processed the message and returned. So there is no concurrent access to anything, hence the operation is thread-safe.
What is postMessage?
postMessage() is a safe way to send messages between windows in different domains or origins. One can also post to an IFrame. The data being sent is serialized using the structured clone algorithm and will accept almost any type of simple or complex data.
How many web workers can I create?
You can spawn as many workers as you wish. You can also pass data to the script being executed in the worker threads and also return value to the main thread upon completion.
What is Reg Key notify?
Notifies the caller about changes to the attributes or contents of a specified registry key.
What is MessageChannel?
The MessageChannel interface of the Channel Messaging API allows us to create a new message channel and send data through it via its two MessagePort properties. Note: This feature is available in Web Workers.
What does waitforsingleobject do?
For example, the count of a semaphore object is decreased by one. The WaitForSingleObject function can wait for the following objects: Memory resource notification Use caution when calling the wait functions and code that directly or indirectly creates windows. If a thread creates any windows, it must process messages.
What is a thread’s message queue?
The identifier of the thread to which the message is to be posted. The function fails if the specified thread does not have a message queue. The system creates a thread’s message queue when the thread makes its first call to one of the User or GDI functions.
How do you get a thread to send a message?
When your thread starts running, it should post a message to itself first to create a message queue, then set a signal to indicate that it is ready to receive messages, then finally enter its message loop. In your class constructor, after calling CreateThread(), it can wait for that signal before then exiting.
How to get extended error information from waitforsingleobject function?
The function has failed. To get extended error information, call GetLastError . The WaitForSingleObject function checks the current state of the specified object. If the object’s state is nonsignaled, the calling thread enters the wait state until the object is signaled or the time-out interval elapses.