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//+private
package mem_virtual
import sync "core:sync/sync2"
Platform_Memory_Block :: struct {
block: Memory_Block,
committed: uint,
reserved: uint,
prev, next: ^Platform_Memory_Block,
}
platform_memory_alloc :: proc "contextless" (to_commit, to_reserve: uint) -> (block: ^Platform_Memory_Block, err: Allocator_Error) {
to_commit, to_reserve := to_commit, to_reserve
to_reserve = max(to_commit, to_reserve)
total_to_reserved := max(to_reserve, size_of(Platform_Memory_Block))
to_commit = clamp(to_commit, size_of(Platform_Memory_Block), total_to_reserved)
data := reserve(total_to_reserved) or_return
commit(raw_data(data), to_commit)
block = (^Platform_Memory_Block)(raw_data(data))
block.committed = to_commit
block.reserved = to_reserve
return
}
platform_memory_free :: proc "contextless" (block: ^Platform_Memory_Block) {
if block != nil {
release(block, block.reserved)
}
}
platform_mutex_lock :: proc() {
sync.mutex_lock(&global_memory_block_mutex)
}
platform_mutex_unlock :: proc() {
sync.mutex_unlock(&global_memory_block_mutex)
}
global_memory_block_mutex: sync.Mutex
global_platform_memory_block_sentinel: Platform_Memory_Block
global_platform_memory_block_sentinel_set: bool
@(init)
platform_memory_init :: proc() {
if !global_platform_memory_block_sentinel_set {
_platform_memory_init()
global_platform_memory_block_sentinel.prev = &global_platform_memory_block_sentinel
global_platform_memory_block_sentinel.next = &global_platform_memory_block_sentinel
global_platform_memory_block_sentinel_set = true
}
}
platform_memory_commit :: proc "contextless" (block: ^Platform_Memory_Block, to_commit: uint) -> (err: Allocator_Error) {
if to_commit < block.committed {
return nil
}
if to_commit > block.reserved {
return .Out_Of_Memory
}
commit(block, to_commit) or_return
block.committed = to_commit
return nil
}
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