happens-before – Tarik Billa

Java memory model: volatile variables and happens-before

August 17, 2023 by Tarik

i = 1 always happens-before v = 2 True. By JLS section 17.4.5, If x and y are actions of the same thread and x comes before y in program order, then hb(x, y). v = 2 happens-before vDst = v in JMM only if it’s actually happens before in time i = 1 happens-before … Read more

Memory Consistency – happens-before relationship in Java [duplicate]

July 24, 2023 by Tarik

Modern CPUs don’t always write data to memory in the order it was updated, for example if you run the pseudo code (assuming variables are always stored to memory here for simplicity); a = 1 b = a + 1 …the CPU may very well write b to memory before it writes a to memory. … Read more