kopia lustrzana https://github.com/ha7ilm/csdr
44 wiersze
1.3 KiB
C++
44 wiersze
1.3 KiB
C++
//tsmpool stands for Thread-Safe Memory Pool.
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//It implements a big circular buffer that one thread writes into, and multiple threads read from.
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//The reader threads have lower priority than the writer thread (they can be left behind if the don't read fast enough).
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#include <vector>
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#include <pthread.h>
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#define TSM_DEBUG 0
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#include <stdio.h>
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using namespace std;
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typedef struct tsmthread_s
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{
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int read_index; //it always points to the next buffer to be read
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} tsmthread_t;
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class tsmpool
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{
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private:
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vector<tsmthread_t*> threads;
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vector<void*> buffers;
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int threads_cntr;
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pthread_mutex_t mutex;
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int ok; //tsmpool is expected to be included in C-style programs.
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// If something fails in the constructor, it will be seen here instead of a try{}catch{}
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int write_index; //it always points to the next buffer to be written
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int lowest_read_index; //unused
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int my_read_index; //it is used when tsmpool is used as a single writer - single reader circular buffer
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public:
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const size_t size;
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const int num;
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int is_ok();
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tsmpool(size_t size, int num);
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void* get_write_buffer();
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tsmthread_t* register_thread();
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void remove_thread(tsmthread_t* thread);
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void* get_read_buffer(tsmthread_t* thread);
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int index_next(int index) { return (index+1==num)?0:index+1; }
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int index_before(int index) { return (index-1<0)?num-1:index-1; }
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};
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