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Definition of Upcall
1. Noun. (computing programming) A call from a lower-level subsystem, such as a kernel or framework, to a higher-level subsystem, such as user code. ¹
¹ Source: wiktionary.com
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1. Noun. (computing programming) A call from a lower-level subsystem, such as a kernel or framework, to a higher-level subsystem, such as user code. ¹
¹ Source: wiktionary.com