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08166b27b1
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.
100 lines
2.5 KiB
C
100 lines
2.5 KiB
C
#ifndef HEADER_Vector
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#define HEADER_Vector
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/*
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htop - Vector.h
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(C) 2004-2011 Hisham H. Muhammad
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Released under the GNU GPLv2+, see the COPYING file
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in the source distribution for its full text.
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*/
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#include "Object.h"
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#include <stdbool.h>
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#ifndef DEFAULT_SIZE
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#define DEFAULT_SIZE (-1)
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#endif
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typedef struct Vector_ {
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Object** array;
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const ObjectClass* type;
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int arraySize;
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int growthRate;
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int items;
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/* lowest index of a pending soft remove/delete operation,
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used to speed up compaction */
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int dirty_index;
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/* count of soft deletes, required for Vector_count to work in debug mode */
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int dirty_count;
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bool owner;
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} Vector;
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Vector* Vector_new(const ObjectClass* type, bool owner, int size);
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void Vector_delete(Vector* this);
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void Vector_prune(Vector* this);
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void Vector_quickSortCustomCompare(Vector* this, Object_Compare compare);
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static inline void Vector_quickSort(Vector* this) {
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Vector_quickSortCustomCompare(this, this->type->compare);
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}
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void Vector_insertionSort(Vector* this);
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void Vector_insert(Vector* this, int idx, void* data_);
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Object* Vector_take(Vector* this, int idx);
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Object* Vector_remove(Vector* this, int idx);
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/* Vector_softRemove marks the item at index idx for deletion without
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reclaiming any space. If owned, the item is immediately freed.
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Vector_compact must be called to reclaim space.*/
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Object* Vector_softRemove(Vector* this, int idx);
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/* Vector_compact reclaims space free'd up by Vector_softRemove, if any. */
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void Vector_compact(Vector* this);
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void Vector_moveUp(Vector* this, int idx);
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void Vector_moveDown(Vector* this, int idx);
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void Vector_set(Vector* this, int idx, void* data_);
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#ifndef NDEBUG
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Object* Vector_get(const Vector* this, int idx);
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int Vector_size(const Vector* this);
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/* Vector_countEquals returns true if the number of non-NULL items
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in the Vector is equal to expectedCount. This is only for debugging
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and consistency checks. */
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bool Vector_countEquals(const Vector* this, unsigned int expectedCount);
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#else /* NDEBUG */
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static inline Object* Vector_get(const Vector* this, int idx) {
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return this->array[idx];
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}
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static inline int Vector_size(const Vector* this) {
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return this->items;
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}
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#endif /* NDEBUG */
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static inline const ObjectClass* Vector_type(const Vector* this) {
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return this->type;
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}
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void Vector_add(Vector* this, void* data_);
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int Vector_indexOf(const Vector* this, const void* search_, Object_Compare compare);
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void Vector_splice(Vector* this, Vector* from);
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#endif
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