*/ uintptr_t seq; /* Data pointer. */ void *data; } specific_1stblock[PTHREAD_KEY_2NDLEVEL_SIZE]; /* Two-level array for the thread-specific data. */ struct pthread_key_data *specific[PTHREAD_KEY_1STLEVEL_SIZE]; }; pthread 结构所在内存块地址 在 FS 寄存器中, 通过FS 寄存器可引用 ...
我们在上一篇线程本地存储TLS(Thread Local Storage)的原理和实现——分类和原理中曾经说过TLS可以分为两类:静态TLS和动态TLS。然后又分别说明了两者在程序实现时的用法,并且还说明了windows对这两类TLS的实现原理,我们本文的目的是从底层实现的角度深入探究,深刻理解原理。 先考虑以下两个问题: 1、在上一篇中,我们...
Thread Local Storage 1. 什么是TLS? TLS是Thread Local Storage(线程局部存储)的简称,是一项解决多线程内部变量使用问题的技术。 用于将某些数据和一特定线程关联起来,即,这些数据为关联线程所独有(私有)。 在多线程编程中, 同一个变量, 如果要让多个线程共享访问, 那么这个变量可以使用关键字volatile进行声明; 而...
constNUM: ::std::thread::LocalKey<Cell<i32>>={#[inline]fn__init()->Cell<i32>{Cell::new(0)}unsafe{use::std::mem::needs_drop;use::std::thread::LocalKey;use::std::thread::local_impl::LazyStorage;LocalKey::new(const{ifneeds_drop::<Cell<i32>>(){|init|{#[thread_local]staticVA...
intpthread_setspecific(pthread_key_t key, const void *value); Returns 0 on success, or a positive error number on error void *pthread_getspecific(pthread_key_t key); Returns pointer, or NULL if no thread-specific data isassociated with key ...
structure the thread-local data is stored after the "task control block" at a known offset. The compiler knows the offset of a variable in the thread-local storage section and the fixed offset. It can therefore directly use the offset to the thread pointer to address a thread-local ...
See Deferred Allocation of Thread-Local Storage Blocks.Each remaining element in the vector, dtvt,m, is a pointer to the block reserved for the TLS belonging to dynamic object m.For dynamically loaded, post-startup objects, the thread library defers the allocation of TLS blocks. This ...
The address of a thread local variable is not considered constant, and any expression involving such an address is not considered a constant expression. This means that you cannot use the address of a thread local variable as an initializer for a pointer. For example, the compiler flags the ...
The address of a thread local object is not considered constant, and any expression involving such an address isn't considered a constant expression. In standard C, the effect is to disallow the use of the address of a thread local variable as an initializer for an object or pointer. For ...
(TypeObject), pointer :: pObject type(TypeTether), pointer :: pTether type(TypeFSInput), pointer :: pFSInput end type TypeThreadContext type (TypeThreadContext) :: ThreadContext COMMON /CONTEXT/ ThreadContext !$OMP THREADPRIVATE(/CONTEXT/) Jim Dempsey Translate 0 Kudos Copy link ...