Threads in the new ISO C Standard from 2011

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Header File C11 threads are similar to but simpler than Pthreads. thrd_t — thread type once_flag — a type for performing initializations exactly one time mtx_t — mutex type cnd_t — condition variable type tss_t — thread specific storage (not the same as _Thread_local) Jonas Skeppstedt (js@cs.lth.se) Lecture 6 2013 62 / 70
Initialization Function void call_once(once_flag* flag, void (*func)(void)); The flag should be initialized with: once_flag flag = ONCE_FLAG_INIT; If multiple threads invoke call_once with the same flag, the function will only be called one time, and the others will wait until the call to func returns. Jonas Skeppstedt (js@cs.lth.se) Lecture 6 2013 63 / 70
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Threads in the new ISO C Standard f
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Atomic Objects Atomic objects are n
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Using Atomic Objects Members of an
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Lock Free Property To know whether
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Memory Order for Atomic Operations
Page 11 and 12: Answer: Yes The code may execute in
Page 13 and 14: Atomic Compare and Exchange There a
Page 15 and 16: Weak Compare and Exchange Functions
Page 17 and 18: Atomic Fetch and Modify Functions T
Page 19 and 20: Atomic Flag The atomic flag type an
Page 21 and 22: The C11 Memory Consistency Model fo
Page 23 and 24: Release and Acquire, and Consume Re
Page 25 and 26: Happens Before and Data Races We wi
Page 27 and 28: Sequenced Before The most common se
Page 29 and 30: An Example _Atomic int m; int u; //
Page 31 and 32: Dependences Dependences are intra-t
Page 33 and 34: Definition of Dependency in C11 A c
Page 35 and 36: Inter-Thread Happens Before An eval
Page 37 and 38: Read-Copy Update RCU is an alternat
Page 39 and 40: A Simplified Example Consider the f
Page 41 and 42: More Details About Dependences Reca
Page 43 and 44: Constant Propagation Example 2(3) T
Page 45 and 46: One More Data Dependency a = atomic
Page 47 and 48: Load and Reserve/Store Conditional
Page 49 and 50: Power Memory Barrier Instructions T
Page 51 and 52: lwsync Memory Barrier for Release O
Page 53 and 54: c;isync Memory Barrier for Load Acq
Page 55 and 56: Cumulative Ordering If the memory a
Page 57 and 58: Implementation on Power The followi
Page 59 and 60: Store Store relaxed st Store releas
Page 61: Acquire and Release a Spin Lock # a
Page 65 and 66: Mutex Options for mtx_init Function
Page 67 and 68: Condition Variable Functions int cn
Page 69 and 70: Thread Functions int thrd_create(th
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Threads in the new ISO C Standard from 2011

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