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18-SynchronizationProblems - Classic Synchronization...

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Copyright  © : Nahrstedt, Angrave, Campbell 1 Classic  Synchronization  Problems Producer Consumer Reader-Writer Dining Philosophers 4 Formal Requirements for deadlock
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Copyright  © : Nahrstedt, Angrave, Campbell 2 Review - Producer Consumer  using Semaphores bufin bufout #include <errno.h> #include <pthread.h> #include <semaphore.h> static  mytype  buffer[BUFSIZE]; static int bufin = 0; static int bufout = 0; static sem_t semlock;   // =1 static sem_t semitems; // =0 static sem_t semslots;  // =BUFSIZE Note: #semitems+#semslots=BUFSIZE
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Copyright  © : Nahrstedt, Angrave, Campbell 3 Reader-Writer Difficulty   Allow 1+ Reader in critical section at  same time. Reader Writer Reader OK No Writer NO No
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Copyright  © : Nahrstedt, Angrave, Campbell 4 Reader-Writer Problem readers: read data writers: write data Rule: Multiple readers can read the data simultaneously Only one writer can write the data at any time A reader and a writer cannot be in critical section together. Locking table: whether any two can be in the critical section  simultaneously Reader Writer Reader   OK No Writer NO No
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Copyright  © : Nahrstedt, Angrave, Campbell 5 Reader-Writer Solution?
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