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CSE220: SystemsProgramming POSIXThreadsandSynchronization Ethan Blanton Department of Computer Science and Engineering University at Buffalo Introduction Threads Mutexes Condition Variables Semaphores Summary References POSIXThreads ThePOSIXthreadsAPIaddsthreadingtoUnix. Youwill also see this API called Pthreads or pthreads. Early Unix provided only the process model for concurrency. POSIXthreads look like processes, but share more resources. Every POSIX thread starts with a function. ©2020EthanBlanton/CSE220: SystemsProgramming Introduction Threads Mutexes Condition Variables Semaphores Summary References POSIXSynchronization Pthreads also provides synchronization mechanisms. In fact, it provides a rather rich set of options! Mutexes Semaphores Condition variables Thread joining 1 Memorybarriers Only semaphores are covered in detail in CS:APP. 1 Wewon’ttalk about these. ©2020EthanBlanton/CSE220: SystemsProgramming Introduction Threads Mutexes Condition Variables Semaphores Summary References Compilation with Pthreads Pthreads may require extra compilation options. OnmodernLinux,use-pthreadbothwhencompilingandlinking. Onsomeothersystems,otheroptions may be required: Provide a different compiler or linker option (such as -pthreads) Compile with some preprocessor define (e.g., -DPTHREAD, -D_REENTRANT) Link with a library (e.g., -lpthread) …readthedocumentation! ©2020EthanBlanton/CSE220: SystemsProgramming
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