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buflib: Try harder in buflib_alloc_maximum().

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This function will now ask shrinkable allocations to give up all of their
memory. With future support of playback.c this can be used as a safe
replacement for audio_get_buffer().

Change-Id: I290a51d2c75254e66baf5698c41dc444dea6247a
This commit is contained in:
Thomas Martitz 2013-05-29 07:12:01 +02:00
parent 9f878b105d
commit d25a512caf
2 changed files with 17 additions and 4 deletions
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8
firmware/include/buflib.h
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@ -111,10 +111,10 @@ struct buflib_callbacks {
void (*sync_callback)(int handle, bool sync_on);
};
#define BUFLIB_SHRINK_POS_MASK ((1<<0|1<<1)<<30)
#define BUFLIB_SHRINK_SIZE_MASK (~BUFLIB_SHRINK_POS_MASK)
#define BUFLIB_SHRINK_POS_FRONT (1u<<31)
#define BUFLIB_SHRINK_POS_BACK (1u<<30)
#define BUFLIB_SHRINK_POS_MASK (BUFLIB_SHRINK_POS_FRONT|BUFLIB_SHRINK_POS_BACK)
/**
* Possible return values for the callbacks, some of them can cause
@ -193,8 +193,10 @@ int buflib_alloc_ex(struct buflib_context *ctx, size_t size, const char *name,
* will allow buflib to permit allocations by shrinking the buffer returned by
* this function.
*
* Note that this currently gives whatever buflib_available() returns. However,
* do not depend on this behavior, it may change.
* Note that this might return many more bytes than buflib_available() or
* buflib_allocatable() return, because it agressively compacts the pool
* and even shrinks other allocations. However, do not depend on this behavior,
* it may change.
*
* name: A string identifier giving this allocation a name
* size: The actual size will be returned into size