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Expand documentation for custom allocator

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Fixes #2298
This commit is contained in:
Camilla Löwy
2024-01-31 01:45:02 +01:00
parent a12311e596
commit 2afd57bf9b
2 changed files with 78 additions and 24 deletions
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87
include/GLFW/glfw3.h
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@@ -1416,16 +1416,25 @@ typedef struct GLFWcursor GLFWcursor;
* or `NULL` if allocation failed. Note that not all parts of GLFW handle allocation
* failures gracefully yet.
*
* This function may be called during @ref glfwInit but before the library is
* flagged as initialized, as well as during @ref glfwTerminate after the
* library is no longer flagged as initialized.
* This function must support being called during @ref glfwInit but before the library is
* flagged as initialized, as well as during @ref glfwTerminate after the library is no
* longer flagged as initialized.
*
* Any memory allocated by this function will be deallocated during library
* termination or earlier.
* Any memory allocated via this function will be deallocated via the same allocator
* during library termination or earlier.
*
* Any memory allocated via this function must be suitably aligned for any object type.
* If you are using C99 or earlier, this alignment is platform-dependent but will be the
* same as what `malloc` provides. If you are using C11 or later, this is the value of
* `alignof(max_align_t)`.
*
* The size will always be greater than zero. Allocations of size zero are filtered out
* before reaching the custom allocator.
*
* If this function returns `NULL`, GLFW will emit @ref GLFW_OUT_OF_MEMORY.
*
* This function must not call any GLFW function.
*
* @param[in] size The minimum size, in bytes, of the memory block.
* @param[in] user The user-defined pointer from the allocator.
* @return The address of the newly allocated memory block, or `NULL` if an
@@ -1436,7 +1445,8 @@ typedef struct GLFWcursor GLFWcursor;
*
* @reentrancy This function should not call any GLFW function.
*
* @thread_safety This function may be called from any thread that calls GLFW functions.
* @thread_safety This function must support being called from any thread that calls GLFW
* functions.
*
* @sa @ref init_allocator
* @sa @ref GLFWallocator
@@ -1459,16 +1469,26 @@ typedef void* (* GLFWallocatefun)(size_t size, void* user);
* `NULL` if allocation failed. Note that not all parts of GLFW handle allocation
* failures gracefully yet.
*
* This function may be called during @ref glfwInit but before the library is
* flagged as initialized, as well as during @ref glfwTerminate after the
* library is no longer flagged as initialized.
* This function must support being called during @ref glfwInit but before the library is
* flagged as initialized, as well as during @ref glfwTerminate after the library is no
* longer flagged as initialized.
*
* Any memory allocated by this function will be deallocated during library
* termination or earlier.
* Any memory allocated via this function will be deallocated via the same allocator
* during library termination or earlier.
*
* Any memory allocated via this function must be suitably aligned for any object type.
* If you are using C99 or earlier, this alignment is platform-dependent but will be the
* same as what `realloc` provides. If you are using C11 or later, this is the value of
* `alignof(max_align_t)`.
*
* The block address will never be `NULL` and the size will always be greater than zero.
* Reallocations of a block to size zero are converted into deallocations. Reallocations
* of `NULL` to a non-zero size are converted into regular allocations.
* Reallocations of a block to size zero are converted into deallocations before reaching
* the custom allocator. Reallocations of `NULL` to a non-zero size are converted into
* regular allocations before reaching the custom allocator.
*
* If this function returns `NULL`, GLFW will emit @ref GLFW_OUT_OF_MEMORY.
*
* This function must not call any GLFW function.
*
* @param[in] block The address of the memory block to reallocate.
* @param[in] size The new minimum size, in bytes, of the memory block.
@@ -1481,7 +1501,8 @@ typedef void* (* GLFWallocatefun)(size_t size, void* user);
*
* @reentrancy This function should not call any GLFW function.
*
* @thread_safety This function may be called from any thread that calls GLFW functions.
* @thread_safety This function must support being called from any thread that calls GLFW
* functions.
*
* @sa @ref init_allocator
* @sa @ref GLFWallocator
@@ -1503,13 +1524,17 @@ typedef void* (* GLFWreallocatefun)(void* block, size_t size, void* user);
* This function may deallocate the specified memory block. This memory block
* will have been allocated with the same allocator.
*
* This function may be called during @ref glfwInit but before the library is
* flagged as initialized, as well as during @ref glfwTerminate after the
* library is no longer flagged as initialized.
* This function must support being called during @ref glfwInit but before the library is
* flagged as initialized, as well as during @ref glfwTerminate after the library is no
* longer flagged as initialized.
*
* The block address will never be `NULL`. Deallocations of `NULL` are filtered out
* before reaching the custom allocator.
*
* If this function returns `NULL`, GLFW will emit @ref GLFW_OUT_OF_MEMORY.
*
* This function must not call any GLFW function.
*
* @param[in] block The address of the memory block to deallocate.
* @param[in] user The user-defined pointer from the allocator.
*
@@ -1518,7 +1543,8 @@ typedef void* (* GLFWreallocatefun)(void* block, size_t size, void* user);
*
* @reentrancy This function should not call any GLFW function.
*
* @thread_safety This function may be called from any thread that calls GLFW functions.
* @thread_safety This function must support being called from any thread that calls GLFW
* functions.
*
* @sa @ref init_allocator
* @sa @ref GLFWallocator
@@ -2086,7 +2112,10 @@ typedef struct GLFWgamepadstate
float axes[6];
} GLFWgamepadstate;
/*! @brief
/*! @brief Custom heap memory allocator.
*
* This describes a custom heap memory allocator for GLFW. To set an allocator, pass it
* to @ref glfwInitAllocator before initializing the library.
*
* @sa @ref init_allocator
* @sa @ref glfwInitAllocator
@@ -2097,9 +2126,21 @@ typedef struct GLFWgamepadstate
*/
typedef struct GLFWallocator
{
/*! The memory allocation function. See @ref GLFWallocatefun for details about
* allocation function.
*/
GLFWallocatefun allocate;
/*! The memory reallocation function. See @ref GLFWreallocatefun for details about
* reallocation function.
*/
GLFWreallocatefun reallocate;
/*! The memory deallocation function. See @ref GLFWdeallocatefun for details about
* deallocation function.
*/
GLFWdeallocatefun deallocate;
/*! The user pointer for this custom allocator. This value will be passed to the
* allocator functions.
*/
void* user;
} GLFWallocator;
@@ -2232,8 +2273,12 @@ GLFWAPI void glfwInitHint(int hint, int value);
* To use the default allocator, call this function with a `NULL` argument.
*
* If you specify an allocator struct, every member must be a valid function
* pointer. If any member is `NULL`, this function emits @ref
* GLFW_INVALID_VALUE and the init allocator is unchanged.
* pointer. If any member is `NULL`, this function will emit @ref
* GLFW_INVALID_VALUE and the init allocator will be unchanged.
*
* The functions in the allocator must fulfil a number of requirements. See the
* documentation for @ref GLFWallocatefun, @ref GLFWreallocatefun and @ref
* GLFWdeallocatefun for details.
*
* @param[in] allocator The allocator to use at the next initialization, or
* `NULL` to use the default one.