Shared Memory Programming with Pthreads
Shared Memory Programming with Pthreads
Pacheco. Chapter 4 T. Yang. UCSB CS140. Spring 2014
# Chapter Subtitle
Outline
? Shared memory programming: Overview ? POSIX pthreads ? Critical section & thread synchronization.
Mutexes. Producer-consumer synchronization and
semaphores. Barriers and condition variables. Read-write locks. ? Thread safety.
Copyright ? 2010, Elsevier Inc. All rights Reserved
Shared Memory Architecture
Copyright ? 2010, Elsevier Inc. All rights Reserved
Processes and Threads
? A process is an instance of a running (or suspended) program.
? Threads are analogous to a "light-weight" process. ? In a shared memory program a single process may
have multiple threads of control.
Copyright ? 2010, Elsevier Inc. All rights Reserved
Logical View of Threads ? Threads are created within a process
A process
T2 T4
T1 shared code, data and kernel context
T5
T3
Process hierarchy
P1 sh sh sh foo
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