If the operation sets an internal state flag that was registered with member exceptions, the function throws an exception of member type failure. Multiple flags may be set by a single operation. When set, the integrity of the stream may have been affected. May be set if the construction of sentry failed.Įither an insertion on the stream failed, or some other error happened (such as when this function catches an exception thrown by an internal operation). Integer value of type streamsize representing the size in characters of the block of data to write.Įrrors are signaled by modifying the internal state flags: Parameters s Pointer to an array of at least n characters.

Then (if good), it inserts character into its associated stream buffer object as if calling its member functions sputc or sputn until n characters have been written or until an insertion fails (in this case it sets the badbit flag).įinally, it destroys the sentry object before returning. Semaphores are used to overcome the critical section problem.

Internally, the function accesses the output sequence by first constructing a sentry object. What is a semaphore A semaphore is a non-negative variable which can be used to access a common resource of the operating system.

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