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ProcessList: fix quadratic process removal when scanning

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This commit changes ProcessList_scan to lazily remove Processes by
index, which is known, instead of performing a brute-force search by
pid and immediately reclaiming the lost vector space via compaction.

Searching by pid is potentially quadratic in ProcessList_scan because
the process we are searching for is always at the back of the vector
(the scan starts from the back of the vector). Additionally, removal
via Vector_remove immediately reclaims space (by sliding elements
down).

With these changes process removal in ProcessList_scan is now linear.

Changes:
  * ProcessList: add new ProcessList_removeIndex function to remove
    by index
  * Vector: add Vector_softRemove and Vector_compact functions to
    support lazy removal/deletion of entries Vector_softRemove
    Vector_compact
  * Vector: replace Vector_count with Vector_countEquals since it only
    used for consistency assertions.
This commit is contained in:
Charlie Vieth
2022-02-05 18:47:43 -05:00
committed by BenBE
parent c7413fd677
commit 08166b27b1
5 changed files with 127 additions and 35 deletions
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7
Process.c
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@ -1095,13 +1095,6 @@ bool Process_sendSignal(Process* this, Arg sgn) {
return kill(this->pid, sgn.i) == 0;
}
int Process_pidCompare(const void* v1, const void* v2) {
const Process* p1 = (const Process*)v1;
const Process* p2 = (const Process*)v2;
return SPACESHIP_NUMBER(p1->pid, p2->pid);
}
int Process_compare(const void* v1, const void* v2) {
const Process* p1 = (const Process*)v1;
const Process* p2 = (const Process*)v2;