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48 lines
1.9 KiB
C
48 lines
1.9 KiB
C
/* -*- mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
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// vim: expandtab:ts=8:sw=4:softtabstop=4:
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// A threadpool is a limited set of threads that can be used to apply a
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// function to work contained in a work queue. The work queue is outside
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// of the scope of the threadpool; the threadpool merely provides
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// mechanisms to grow the number of threads in the threadpool on demand.
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typedef struct threadpool *THREADPOOL;
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// Create a new threadpool
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// Effects: a new threadpool is allocated and initialized. the number of
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// threads in the threadpool is limited to max_threads. initially, there
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// are no threads in the pool.
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// Returns: if there are no errors, the threadpool is set and zero is returned.
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// Otherwise, an error number is returned.
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int threadpool_create(THREADPOOL *threadpoolptr, int max_threads);
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// Destroy a threadpool
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// Effects: the calling thread joins with all of the threads in the threadpool.
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// Effects: the threadpool memory is freed.
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// Returns: the threadpool is set to null.
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void threadpool_destroy(THREADPOOL *threadpoolptr);
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// Maybe add a thread to the threadpool.
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// Effects: the number of threads in the threadpool is expanded by 1 as long
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// as the current number of threads in the threadpool is less than the max
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// and there are no idle threads.
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// Effects: if the thread is create, it calls the function f with argument arg
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// Expects: external serialization on this function; only one thread may
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// execute this function
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void threadpool_maybe_add(THREADPOOL theadpool, void *(*f)(void *), void *arg);
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// Set the current thread busy
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// Effects: the threadpool keeps a count of the number of idle threads. It
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// uses this count to control the creation of additional threads.
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void threadpool_set_thread_busy(THREADPOOL);
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// Set the current thread idle
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void threadpool_set_thread_idle(THREADPOOL);
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// get the current number of threads
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int threadpool_get_current_threads(THREADPOOL);
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