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The post-increment and post-decrement operators increase (or decrease) the value of their operand by 1, but the value of the expression is the operand's value prior to the increment (or decrement) operation. In languages where increment/decrement is not an expression (e.g., Go), only one version is needed (in the case of Go, post operators only).
[1] [4] Conversely, the memory order is called weak or relaxed when one thread cannot predict the order of operations arising from another thread. [1] [4] Many naïvely written parallel algorithms fail when compiled or executed with a weak memory order. [5] [6] The problem is most often solved by inserting memory barrier instructions into the ...
When accessed via memory indirect addressing, these locations would automatically increment prior to use. [29] This made it easy to step through memory in a loop without needing to use the accumulator to increment the address. The Data General Nova minicomputer had 16 special memory locations at addresses 16 through 31. [30]
In computer science, the fetch-and-add (FAA) CPU instruction atomically increments the contents of a memory location by a specified value. That is, fetch-and-add performs the following operation: increment the value at address x by a, where x is a memory location and a is some value, and return the original value at x.
After the increment, if the pre-increment value was negative (meaning there are processes waiting for a resource), it transfers a blocked process from the semaphore's waiting queue to the ready queue. Many operating systems provide efficient semaphore primitives that unblock a waiting process when the semaphore is incremented.
Registers are normally measured by the number of bits they can hold, for example, an 8-bit register, 32-bit register, 64-bit register, 128-bit register, or more.In some instruction sets, the registers can operate in various modes, breaking down their storage memory into smaller parts (32-bit into four 8-bit ones, for instance) to which multiple data (vector, or one-dimensional array of data ...
Start monitoring a memory location for memory writes. The memory address to monitor is given by DS:AX/EAX/RAX. [m] ECX and EDX are reserved for extra extension and hint flags, respectively. [n] Usually 0 [o] Prescott, Yonah, Bonnell, K10, Nano: MWAIT [l] MWAIT EAX,ECX: NP 0F 01 C9: Wait for a write to a monitored memory location previously ...
Similarly, with 3*x++, where though the post-fix ++ is designed to act AFTER the entire expression is evaluated, the precedence table makes it clear that ONLY x gets incremented (and NOT 3*x). In fact, the expression ( tmp=x++ , 3*tmp ) is evaluated with tmp being a temporary value.