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ARM Compiler ARM C and C++ Libraries and Floating-Point Support User Guide : ARM C libraries and thread-safe functions

ARM C libraries and thread-safe functions

thread-safe function protects shared resources from concurrent access using locks.

Thread safety concerns only how a function is implemented and not its external interface. In C, local variables are held in processor registers, or if the compiler runs out of registers, are dynamically allocated on the stack. Therefore, any function that does not use static data, or other shared resources, is thread-safe.

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