Op Code (Hex) | Operand 1 | |||
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03B9 | Mark identifier |
Bound program access |
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Note: The term "heap space" in this instruction refers to an "activation group-based heap space".
Description: All heap space allocations which have occurred from the heap space since it was marked, with the mark identifier supplied in operand 1, are freed. This may include heap space storage marked by intervening Set Activation Group-Based Heap Space Storage Mark (SETHSSMK) instructions. The mark identifier specified in operand 1 and all mark identifiers obtained since the heap space was marked by operand 1 are cleared from the heap space. An attempt to free heap space storage from a mark that has already been cleared by a previous FREHSSMK instruction will result in an invalid mark identifier (hex 4507) exception. A free of heap space storage can be performed without regard to the activation group in which it was allocated, as long as the allocation was done by a thread in the same process.
FREHSSMK will signal an object domain or hardware storage protection violation (hex 4401) exception if a program running user state attempts a Free Activation Group-Based Heap Space Storage From Mark for a heap space with a domain of system.
Operand 1 is not modified by the instruction.
06 Addressing
08 Argument/Parameter
10 Damage Encountered
1C Machine-Dependent
20 Machine Support
24 Pointer Specification
44 Protection Violation
45 Heap Space