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How to use printf in multiple threads stack overflow?
In order not to mix the outputs from different threads, you need to make sure that only one thread uses printf at a time. To achieve this, the simplest solution is to use a mutex. At the beginning initialize the mutex :
How to create thread before blocking read call?
Create the thread before your blocking read call, set some sort of flag on input and read the flag in your timeout handler. Note you will need to make this thread safe. You can just use alarm () before calling the input functtion and write a signal handler for SIGALRM and terinate your program in the signal handler.
Is the printf function Thread safe in POSIX?
Character-level output on a stream is thread-safe unless using the ‘unlocked’ functions without first locking the file. Higher-level functions such as printf () conceptually call flockfile () at the start an funlockfile () at the end, which means that the POSIX-defined stream output functions are also thread-safe per call.
Are there any functions that are not thread safe?
In the section of the System Interfaces: General Information section of POSIX on the subject of Threads, it says: All functions defined by this volume of POSIX.1-2008 shall be thread-safe, except that the following functions1 need not be thread-safe. …a list of functions that need not be thread-safe…
What does the printf function do in Java?
The code execution begins from the start of the main () function. The printf () is a library function to send formatted output to the screen. The function prints the string inside quotations.
What are the arguments in the printf command?
In the example printf “My brother %s is %d years old. ” Prakash 21, the entire “My brother %s is %d years old. ” is format and it is followed by the arguments Prakash and 21. The arguments are used for replacing the format specifiers (%s, %d etc) which I’ll explain later in this article.
What does return 0 mean in printf ( ) function?
The return 0; statement inside the main () function is the “Exit status” of the program. It’s optional. We use %d format specifier to print int types. Here, the %d inside the quotations will be replaced by the value of testInteger.