java.lang.Object
- org.lwjgl.system.jemalloc.JEmalloc

```
public class JEmalloc
extends java.lang.Object
```
Native bindings to jemalloc.
jemalloc is a general purpose malloc implementation that emphasizes fragmentation avoidance and scalable concurrency support. jemalloc first came into use as the FreeBSD libc allocator in 2005, and since then it has found its way into numerous applications that rely on its predictable behavior. In 2010 jemalloc development efforts broadened to include developer support features such as heap profiling, Valgrind integration, and extensive monitoring/tuning hooks. Modern jemalloc releases continue to be integrated back into FreeBSD, and therefore versatility remains critical. Ongoing development efforts trend toward making jemalloc among the best allocators for a broad range of demanding applications, and eliminating/mitigating weaknesses that have practical repercussions for real world applications.

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class JEmalloc.Functions
Contains the function pointers loaded from the jemalloc SharedLibrary.

Field Summary

Fields
Modifier and Type	Field	Description
`static java.lang.String`	`JEMALLOC_VERSION`	The version string.
`static int`	`JEMALLOC_VERSION_BUGFIX`	The bugfix version.
`static java.lang.String`	`JEMALLOC_VERSION_GID`	The globally unique identifier (git commit hash).
`static int`	`JEMALLOC_VERSION_MAJOR`	The major version.
`static int`	`JEMALLOC_VERSION_MINOR`	The minor version.
`static int`	`JEMALLOC_VERSION_NREV`	The revision number.
`static int`	`MALLCTL_ARENAS_ALL`	Use as arena index in "arena.<i>.{purge,decay,dss}" and "stats.arenas.<i>.*" mallctl interfaces to select all arenas.
`static int`	`MALLCTL_ARENAS_DESTROYED`	Use as arena index in "stats.arenas.<i>.*" mallctl interfaces to select destroyed arenas.
`static int`	`MALLOCX_TCACHE_NONE`	Do not use a thread-specific cache (tcache).
`static int`	`MALLOCX_ZERO`	Initialize newly allocated memory to contain zero bytes.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static org.lwjgl.system.SharedLibrary`	`getLibrary()`	Returns the jemalloc `SharedLibrary`.
`static java.nio.ByteBuffer`	`je_aligned_alloc(long alignment, long size)`	Allocates `size` bytes of memory such that the allocation's base address is an even multiple of `alignment`.
`static java.nio.ByteBuffer`	`je_calloc(long num, long size)`	Allocates space for `num` objects, each `size` bytes in length.
`static void`	`je_dallocx(java.nio.ByteBuffer ptr, int flags)`	Causes the memory referenced by `ptr` to be made available for future allocations.
`static void`	`je_dallocx(java.nio.DoubleBuffer ptr, int flags)`	Causes the memory referenced by `ptr` to be made available for future allocations.
`static void`	`je_dallocx(java.nio.FloatBuffer ptr, int flags)`	Causes the memory referenced by `ptr` to be made available for future allocations.
`static void`	`je_dallocx(java.nio.IntBuffer ptr, int flags)`	Causes the memory referenced by `ptr` to be made available for future allocations.
`static void`	`je_dallocx(java.nio.LongBuffer ptr, int flags)`	Causes the memory referenced by `ptr` to be made available for future allocations.
`static void`	`je_dallocx(java.nio.ShortBuffer ptr, int flags)`	Causes the memory referenced by `ptr` to be made available for future allocations.
`static void`	`je_dallocx(org.lwjgl.PointerBuffer ptr, int flags)`	Causes the memory referenced by `ptr` to be made available for future allocations.
`static void`	`je_free(java.nio.ByteBuffer ptr)`	Causes the allocated memory referenced by `ptr` to be made available for future allocations.
`static void`	`je_free(java.nio.DoubleBuffer ptr)`	Causes the allocated memory referenced by `ptr` to be made available for future allocations.
`static void`	`je_free(java.nio.FloatBuffer ptr)`	Causes the allocated memory referenced by `ptr` to be made available for future allocations.
`static void`	`je_free(java.nio.IntBuffer ptr)`	Causes the allocated memory referenced by `ptr` to be made available for future allocations.
`static void`	`je_free(java.nio.LongBuffer ptr)`	Causes the allocated memory referenced by `ptr` to be made available for future allocations.
`static void`	`je_free(java.nio.ShortBuffer ptr)`	Causes the allocated memory referenced by `ptr` to be made available for future allocations.
`static void`	`je_free(org.lwjgl.PointerBuffer ptr)`	Causes the allocated memory referenced by `ptr` to be made available for future allocations.
`static int`	`je_mallctl(java.lang.CharSequence name, java.nio.ByteBuffer oldp, org.lwjgl.PointerBuffer oldlenp, java.nio.ByteBuffer newp)`	Provides a general interface for introspecting the memory allocator, as well as setting modifiable parameters and triggering actions.
`static int`	`je_mallctl(java.nio.ByteBuffer name, java.nio.ByteBuffer oldp, org.lwjgl.PointerBuffer oldlenp, java.nio.ByteBuffer newp)`	Provides a general interface for introspecting the memory allocator, as well as setting modifiable parameters and triggering actions.
`static int`	`je_mallctlbymib(org.lwjgl.PointerBuffer mib, java.nio.ByteBuffer oldp, org.lwjgl.PointerBuffer oldlenp, java.nio.ByteBuffer newp)`	Similar to `mallctl`, but uses MIBs instead of names.
`static int`	`je_mallctlnametomib(java.lang.CharSequence name, org.lwjgl.PointerBuffer mibp, org.lwjgl.PointerBuffer miblenp)`	Provides a way to avoid repeated name lookups for applications that repeatedly query the same portion of the namespace, by translating a name to a “Management Information Base” (MIB) that can be passed repeatedly to `mallctlbymib`.
`static int`	`je_mallctlnametomib(java.nio.ByteBuffer name, org.lwjgl.PointerBuffer mibp, org.lwjgl.PointerBuffer miblenp)`	Provides a way to avoid repeated name lookups for applications that repeatedly query the same portion of the namespace, by translating a name to a “Management Information Base” (MIB) that can be passed repeatedly to `mallctlbymib`.
`static java.nio.ByteBuffer`	`je_malloc(long size)`	Allocates `size` bytes of uninitialized memory.
`static org.lwjgl.PointerBuffer`	`je_malloc_message()`	Returns the `je_malloc_message` variable.
`static void`	`je_malloc_stats_print(MallocMessageCallbackI write_cb, long cbopaque, java.lang.CharSequence opts)`	Writes human-readable summary statistics via the `write_cb` callback function pointer and `cbopaque` data passed to `write_cb`, or `malloc_message()` if `write_cb` is `NULL`.
`static void`	`je_malloc_stats_print(MallocMessageCallbackI write_cb, long cbopaque, java.nio.ByteBuffer opts)`	Writes human-readable summary statistics via the `write_cb` callback function pointer and `cbopaque` data passed to `write_cb`, or `malloc_message()` if `write_cb` is `NULL`.
`static long`	`je_malloc_usable_size(java.nio.ByteBuffer ptr)`	Returns the usable size of the allocation pointed to by `ptr`.
`static java.nio.ByteBuffer`	`je_mallocx(long size, int flags)`	Allocates at least `size` bytes of memory, and returns a pointer to the base address of the allocation.
`static java.nio.ByteBuffer`	`je_nallocx(long size, int flags)`	Allocates no memory, but it performs the same size computation as the `mallocx` function, and returns the real size of the allocation that would result from the equivalent `mallocx()` function call.
`static int`	`je_posix_memalign(org.lwjgl.PointerBuffer memptr, long alignment, long size)`	Allocates `size` bytes of memory such that the allocation's base address is an even multiple of `alignment`, and returns the allocation in the value pointed to by `memptr`.
`static java.nio.ByteBuffer`	`je_rallocx(java.nio.ByteBuffer ptr, long size, int flags)`	Resizes the allocation at `ptr` to be at least `size` bytes, and returns a pointer to the base address of the resulting allocation, which may or may not have moved from its original location.
`static java.nio.ByteBuffer`	`je_realloc(java.nio.ByteBuffer ptr, long size)`	Changes the size of the previously allocated memory referenced by `ptr` to `size` bytes.
`static long`	`je_sallocx(java.nio.ByteBuffer ptr, int flags)`	Returns the real size of the allocation at `ptr`.
`static void`	`je_sdallocx(java.nio.ByteBuffer ptr, int flags)`	Sized version of `dallocx`.
`static void`	`je_sdallocx(java.nio.DoubleBuffer ptr, int flags)`	Sized version of `dallocx`.
`static void`	`je_sdallocx(java.nio.FloatBuffer ptr, int flags)`	Sized version of `dallocx`.
`static void`	`je_sdallocx(java.nio.IntBuffer ptr, int flags)`	Sized version of `dallocx`.
`static void`	`je_sdallocx(java.nio.LongBuffer ptr, int flags)`	Sized version of `dallocx`.
`static void`	`je_sdallocx(java.nio.ShortBuffer ptr, int flags)`	Sized version of `dallocx`.
`static void`	`je_sdallocx(org.lwjgl.PointerBuffer ptr, int flags)`	Sized version of `dallocx`.
`static long`	`je_xallocx(java.nio.ByteBuffer ptr, long size, long extra, int flags)`	Resizes the allocation at `ptr` in place to be at least size bytes, and returns the real size of the allocation.
`static int`	`MALLOCX_ALIGN(int a)`	Align the memory allocation to start at an address that is a multiple of `a`, where `a` is a power of two.
`static int`	`MALLOCX_ARENA(int a)`	Use the arena specified by the index `a` (and by necessity bypass the thread cache).
`static int`	`MALLOCX_LG_ALIGN(int la)`	Align the memory allocation to start at an address that is a multiple of `(1 << la)`.
`static int`	`MALLOCX_TCACHE(int tc)`	Use the thread-specific cache (tcache) specified by the identifier `tc`, which must have been acquired via the `tcache.create` mallctl.
`static long`	`nje_aligned_alloc(long alignment, long size)`	Unsafe version of: `aligned_alloc`
`static long`	`nje_calloc(long num, long size)`	Unsafe version of: `calloc`
`static void`	`nje_dallocx(long ptr, int flags)`	Unsafe version of: `dallocx`
`static void`	`nje_free(long ptr)`	Unsafe version of: `free`
`static int`	`nje_mallctl(long name, long oldp, long oldlenp, long newp, long newlen)`	Unsafe version of: `mallctl`
`static int`	`nje_mallctlbymib(long mib, long miblen, long oldp, long oldlenp, long newp, long newlen)`	Unsafe version of: `mallctlbymib`
`static int`	`nje_mallctlnametomib(long name, long mibp, long miblenp)`	Unsafe version of: `mallctlnametomib`
`static long`	`nje_malloc(long size)`	Unsafe version of: `malloc`
`static void`	`nje_malloc_stats_print(long write_cb, long cbopaque, long opts)`	Unsafe version of: `malloc_stats_print`
`static long`	`nje_malloc_usable_size(long ptr)`	Unsafe version of: `malloc_usable_size`
`static long`	`nje_mallocx(long size, int flags)`	Unsafe version of: `mallocx`
`static long`	`nje_nallocx(long size, int flags)`	Unsafe version of: `nallocx`
`static int`	`nje_posix_memalign(long memptr, long alignment, long size)`	Unsafe version of: `posix_memalign`
`static long`	`nje_rallocx(long ptr, long size, int flags)`	Unsafe version of: `rallocx`
`static long`	`nje_realloc(long ptr, long size)`	Unsafe version of: `realloc`
`static long`	`nje_sallocx(long ptr, int flags)`	Unsafe version of: `sallocx`
`static void`	`nje_sdallocx(long ptr, long size, int flags)`	Unsafe version of: `sdallocx`
`static long`	`nje_xallocx(long ptr, long size, long extra, int flags)`	Unsafe version of: `xallocx`

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - JEMALLOC_VERSION_MAJOR
    
    The major version.
  - JEMALLOC_VERSION_MINOR
    
    The minor version.
  - JEMALLOC_VERSION_BUGFIX
    
    The bugfix version.
  - JEMALLOC_VERSION_NREV
    
    The revision number.
  - JEMALLOC_VERSION_GID
    
    The globally unique identifier (git commit hash).
  - JEMALLOC_VERSION
    
    The version string.
  - MALLOCX_ZERO
    
    Initialize newly allocated memory to contain zero bytes. In the growing reallocation case, the real size prior to reallocation defines the boundary between untouched bytes and those that are initialized to contain zero bytes. If this macro is absent, newly allocated memory is uninitialized.
  - MALLOCX_TCACHE_NONE
    
    Do not use a thread-specific cache (tcache). Unless MALLOCX_TCACHE(int) or MALLOCX_TCACHE_NONE is specified, an automatically managed tcache will be used under many circumstances. This macro cannot be used in the same flags argument as MALLOCX_TCACHE(tc).
  - MALLCTL_ARENAS_ALL
    
    Use as arena index in "arena.<i>.{purge,decay,dss}" and "stats.arenas.<i>.*" mallctl interfaces to select all arenas.
  - MALLCTL_ARENAS_DESTROYED
    
    Use as arena index in "stats.arenas.<i>.*" mallctl interfaces to select destroyed arenas.
- Method Detail
  - getLibrary
```
public static org.lwjgl.system.SharedLibrary getLibrary()
```
    Returns the jemalloc SharedLibrary.
  - je_malloc_message
```
public static org.lwjgl.PointerBuffer je_malloc_message()
```
    Returns the je_malloc_message variable.
  - nje_malloc
```
public static long nje_malloc(long size)
```
    Unsafe version of: malloc
  - je_malloc
```
@Nullable
public static java.nio.ByteBuffer je_malloc(long size)
```
    Allocates size bytes of uninitialized memory. The allocated space is suitably aligned (after possible pointer coercion) for storage of any type of object.
    
    Parameters:
    
    size - the number of bytes to allocate
  - nje_calloc
```
public static long nje_calloc(long num,
                              long size)
```
    Unsafe version of: calloc
  - je_calloc
```
@Nullable
public static java.nio.ByteBuffer je_calloc(long num,
                                            long size)
```
    Allocates space for num objects, each size bytes in length. The result is identical to calling malloc with an argument of num * size, with the exception that the allocated memory is explicitly initialized to zero bytes.
    
    Parameters:
    
    num - the number of objects to allocate
    
    size - the size of each object, in bytes
  - nje_posix_memalign
```
public static int nje_posix_memalign(long memptr,
                                     long alignment,
                                     long size)
```
    Unsafe version of: posix_memalign
  - je_posix_memalign
```
public static int je_posix_memalign(org.lwjgl.PointerBuffer memptr,
                                    long alignment,
                                    long size)
```
    Allocates size bytes of memory such that the allocation's base address is an even multiple of alignment, and returns the allocation in the value pointed to by memptr. The requested alignment must be a power of 2 at least as large as sizeof(void *).
    
    Parameters:
    
    memptr - returns the allocated memory
    
    alignment - the allocation alignment, in bytes
    
    size - the number of bytes to allocate
  - nje_aligned_alloc
```
public static long nje_aligned_alloc(long alignment,
                                     long size)
```
    Unsafe version of: aligned_alloc
  - je_aligned_alloc
```
@Nullable
public static java.nio.ByteBuffer je_aligned_alloc(long alignment,
                                                   long size)
```
    Allocates size bytes of memory such that the allocation's base address is an even multiple of alignment. The requested alignment must be a power of 2. Behavior is undefined if size is not an integral multiple of alignment.
    
    Parameters:
    
    alignment - the allocation alignment, in bytes
    
    size - the number of bytes to allocate
  - nje_realloc
```
public static long nje_realloc(long ptr,
                               long size)
```
    Unsafe version of: realloc
  - je_realloc
```
@Nullable
public static java.nio.ByteBuffer je_realloc(@Nullable
                                             java.nio.ByteBuffer ptr,
                                             long size)
```
    Changes the size of the previously allocated memory referenced by ptr to size bytes. The contents of the memory are unchanged up to the lesser of the new and old sizes. If the new size is larger, the contents of the newly allocated portion of the memory are undefined. Upon success, the memory referenced by ptr is freed and a pointer to the newly allocated memory is returned. Note that realloc() may move the memory allocation, resulting in a different return value than ptr. If ptr is NULL, the realloc() function behaves identically to malloc() for the specified size.
    
    Parameters:
    
    ptr - the previously allocated memory or NULL
    
    size - the number of bytes to allocate
  - nje_free
```
public static void nje_free(long ptr)
```
    Unsafe version of: free
  - je_free
```
public static void je_free(@Nullable
                           java.nio.ByteBuffer ptr)

public static void je_free(@Nullable
                           java.nio.ShortBuffer ptr)

public static void je_free(@Nullable
                           java.nio.IntBuffer ptr)

public static void je_free(@Nullable
                           java.nio.LongBuffer ptr)

public static void je_free(@Nullable
                           java.nio.FloatBuffer ptr)

public static void je_free(@Nullable
                           java.nio.DoubleBuffer ptr)

public static void je_free(@Nullable
                           org.lwjgl.PointerBuffer ptr)
```
    Causes the allocated memory referenced by ptr to be made available for future allocations. If ptr is NULL, no action occurs.
    
    Parameters:
    
    ptr - the allocated memory to free
  - nje_mallocx
```
public static long nje_mallocx(long size,
                               int flags)
```
    Unsafe version of: mallocx
  - je_mallocx
```
@Nullable
public static java.nio.ByteBuffer je_mallocx(long size,
                                             int flags)
```
    Allocates at least size bytes of memory, and returns a pointer to the base address of the allocation. Behavior is undefined if size is 0, or if request size overflows due to size class and/or alignment constraints.
    
    Parameters:
    
    size - the number of bytes to allocate
    
    flags - a bitfield of zero or more of the MALLOCX macros
  - nje_rallocx
```
public static long nje_rallocx(long ptr,
                               long size,
                               int flags)
```
    Unsafe version of: rallocx
  - je_rallocx
```
@Nullable
public static java.nio.ByteBuffer je_rallocx(@Nullable
                                             java.nio.ByteBuffer ptr,
                                             long size,
                                             int flags)
```
    Resizes the allocation at ptr to be at least size bytes, and returns a pointer to the base address of the resulting allocation, which may or may not have moved from its original location. Behavior is undefined if size is 0, or if request size overflows due to size class and/or alignment constraints.
    
    Parameters:
    
    ptr - the previously allocated memory or NULL
    
    size - the number of bytes to allocate
    
    flags - a bitfield of zero or more of the MALLOCX macros
  - nje_xallocx
```
public static long nje_xallocx(long ptr,
                               long size,
                               long extra,
                               int flags)
```
    Unsafe version of: xallocx
  - je_xallocx
```
public static long je_xallocx(@Nullable
                              java.nio.ByteBuffer ptr,
                              long size,
                              long extra,
                              int flags)
```
    Resizes the allocation at ptr in place to be at least size bytes, and returns the real size of the allocation. If extra is non-zero, an attempt is made to resize the allocation to be at least (size + extra) bytes, though inability to allocate the extra byte(s) will not by itself result in failure to resize. Behavior is undefined if size is 0, or if (size + extra > SIZE_T_MAX).
    
    Parameters:
    
    ptr - the previously allocated memory or NULL
    
    size - the number of bytes to allocate
    
    extra - the number of extra bytes to allocate
    
    flags - a bitfield of zero or more of the MALLOCX macros
  - nje_sallocx
```
public static long nje_sallocx(long ptr,
                               int flags)
```
    Unsafe version of: sallocx
  - je_sallocx
```
public static long je_sallocx(java.nio.ByteBuffer ptr,
                              int flags)
```
    Returns the real size of the allocation at ptr.
    
    Parameters:
    
    ptr - the allocated memory to query
    
    flags - a bitfield of zero or more of the MALLOCX macros
  - nje_dallocx
```
public static void nje_dallocx(long ptr,
                               int flags)
```
    Unsafe version of: dallocx
  - je_dallocx
```
public static void je_dallocx(java.nio.ByteBuffer ptr,
                              int flags)

public static void je_dallocx(java.nio.ShortBuffer ptr,
                              int flags)

public static void je_dallocx(java.nio.IntBuffer ptr,
                              int flags)

public static void je_dallocx(java.nio.LongBuffer ptr,
                              int flags)

public static void je_dallocx(java.nio.FloatBuffer ptr,
                              int flags)

public static void je_dallocx(java.nio.DoubleBuffer ptr,
                              int flags)

public static void je_dallocx(org.lwjgl.PointerBuffer ptr,
                              int flags)
```
    Causes the memory referenced by ptr to be made available for future allocations.
    
    Parameters:
    
    ptr - the allocated memory to deallocate
    
    flags - a bitfield of zero or more of the MALLOCX macros
  - nje_sdallocx
```
public static void nje_sdallocx(long ptr,
                                long size,
                                int flags)
```
    Unsafe version of: sdallocx
    
    Parameters:
    
    size - the number of bytes in ptr
  - je_sdallocx
```
public static void je_sdallocx(java.nio.ByteBuffer ptr,
                               int flags)

public static void je_sdallocx(java.nio.ShortBuffer ptr,
                               int flags)

public static void je_sdallocx(java.nio.IntBuffer ptr,
                               int flags)

public static void je_sdallocx(java.nio.LongBuffer ptr,
                               int flags)

public static void je_sdallocx(java.nio.FloatBuffer ptr,
                               int flags)

public static void je_sdallocx(java.nio.DoubleBuffer ptr,
                               int flags)

public static void je_sdallocx(org.lwjgl.PointerBuffer ptr,
                               int flags)
```
    Sized version of dallocx. The primary optimization over dallocx() is the removal of a metadata read, which often suffers an L1 cache miss.
    
    Parameters:
    
    ptr - the allocated memory to deallocate
    
    flags - a bitfield of zero or more of the MALLOCX macros
  - nje_nallocx
```
public static long nje_nallocx(long size,
                               int flags)
```
    Unsafe version of: nallocx
  - je_nallocx
```
@Nullable
public static java.nio.ByteBuffer je_nallocx(long size,
                                             int flags)
```
    Allocates no memory, but it performs the same size computation as the mallocx function, and returns the real size of the allocation that would result from the equivalent mallocx() function call. Behavior is undefined if size is 0, or if request size overflows due to size class and/or alignment constraints.
    
    Parameters:
    
    size - the number of bytes to allocate
    
    flags - a bitfield of zero or more of the MALLOCX macros
  - nje_mallctl
```
public static int nje_mallctl(long name,
                              long oldp,
                              long oldlenp,
                              long newp,
                              long newlen)
```
    Unsafe version of: mallctl
    
    Parameters:
    
    newlen - the new value length
  - je_mallctl
```
public static int je_mallctl(java.nio.ByteBuffer name,
                             @Nullable
                             java.nio.ByteBuffer oldp,
                             @Nullable
                             org.lwjgl.PointerBuffer oldlenp,
                             @Nullable
                             java.nio.ByteBuffer newp)

public static int je_mallctl(java.lang.CharSequence name,
                             @Nullable
                             java.nio.ByteBuffer oldp,
                             @Nullable
                             org.lwjgl.PointerBuffer oldlenp,
                             @Nullable
                             java.nio.ByteBuffer newp)
```
    Provides a general interface for introspecting the memory allocator, as well as setting modifiable parameters and triggering actions. The period-separated name argument specifies a location in a tree-structured namespace; see the MALLCTL NAMESPACE section for documentation on the tree contents. To read a value, pass a pointer via oldp to adequate space to contain the value, and a pointer to its length via oldlenp; otherwise pass NULL and NULL. Similarly, to write a value, pass a pointer to the value via newp, and its length via newlen; otherwise pass NULL and 0.
    
    Parameters:
    
    name - the namespace location
    
    oldp - returns a value
    
    oldlenp - returns the value length
    
    newp - the new value
  - nje_mallctlnametomib
```
public static int nje_mallctlnametomib(long name,
                                       long mibp,
                                       long miblenp)
```
    Unsafe version of: mallctlnametomib
    
    Parameters:
    
    miblenp - the number of components in mibp
  - je_mallctlnametomib
```
public static int je_mallctlnametomib(java.nio.ByteBuffer name,
                                      org.lwjgl.PointerBuffer mibp,
                                      org.lwjgl.PointerBuffer miblenp)

public static int je_mallctlnametomib(java.lang.CharSequence name,
                                      org.lwjgl.PointerBuffer mibp,
                                      org.lwjgl.PointerBuffer miblenp)
```
    Provides a way to avoid repeated name lookups for applications that repeatedly query the same portion of the namespace, by translating a name to a “Management Information Base” (MIB) that can be passed repeatedly to mallctlbymib. Upon successful return from mallctlnametomib(), mibp contains an array of *miblenp integers, where *miblenp is the lesser of the number of components in name and the input value of *miblenp. Thus it is possible to pass a *miblenp that is smaller than the number of period-separated name components, which results in a partial MIB that can be used as the basis for constructing a complete MIB. For name components that are integers (e.g. the 2 in "arenas.bin.2.size"), the corresponding MIB component will always be that integer. Therefore, it is legitimate to construct code like the following:
    unsigned nbins, i; size_t mib[4]; size_t len, miblen; len = sizeof(nbins); mallctl("arenas.nbins", &nbins, &len, NULL, 0); miblen = 4; mallctlnametomib("arenas.bin.0.size", mib, &miblen); for (i = 0; i < nbins; i++) { size_t bin_size; mib[2] = i; len = sizeof(bin_size); mallctlbymib(mib, miblen, &bin_size, &len, NULL, 0); // Do something with bin_size... }
    Parameters:
    
    name - the namespace location
    
    mibp - an array of integers
    
    miblenp - the number of components in mibp
  - nje_mallctlbymib
```
public static int nje_mallctlbymib(long mib,
                                   long miblen,
                                   long oldp,
                                   long oldlenp,
                                   long newp,
                                   long newlen)
```
    Unsafe version of: mallctlbymib
    
    Parameters:
    
    miblen - the number of elements in mib
    
    newlen - the new value length
  - je_mallctlbymib
```
public static int je_mallctlbymib(org.lwjgl.PointerBuffer mib,
                                  @Nullable
                                  java.nio.ByteBuffer oldp,
                                  @Nullable
                                  org.lwjgl.PointerBuffer oldlenp,
                                  @Nullable
                                  java.nio.ByteBuffer newp)
```
    Similar to mallctl, but uses MIBs instead of names. See mallctlnametomib for details.
    
    Parameters:
    
    mib - a MIB
    
    oldp - returns a value
    
    oldlenp - returns the value length
    
    newp - the new value
  - nje_malloc_stats_print
```
public static void nje_malloc_stats_print(long write_cb,
                                          long cbopaque,
                                          long opts)
```
    Unsafe version of: malloc_stats_print
  - je_malloc_stats_print
```
public static void je_malloc_stats_print(@Nullable
                                         MallocMessageCallbackI write_cb,
                                         long cbopaque,
                                         @Nullable
                                         java.nio.ByteBuffer opts)

public static void je_malloc_stats_print(@Nullable
                                         MallocMessageCallbackI write_cb,
                                         long cbopaque,
                                         @Nullable
                                         java.lang.CharSequence opts)
```
    Writes human-readable summary statistics via the write_cb callback function pointer and cbopaque data passed to write_cb, or malloc_message() if write_cb is NULL. This function can be called repeatedly. General information that never changes during execution can be omitted by specifying "g" as a character within the opts string. Note that malloc_message() uses the mallctl*() functions internally, so inconsistent statistics can be reported if multiple threads use these functions simultaneously. If --enable-stats is specified during configuration, “m” and “a” can be specified to omit merged arena and per arena statistics, respectively; “b” and “l” can be specified to omit per size class statistics for bins and large objects, respectively. Unrecognized characters are silently ignored. Note that thread caching may prevent some statistics from being completely up to date, since extra locking would be required to merge counters that track thread cache operations.
    
    Parameters:
    
    write_cb - the print callback, or NULL to use malloc_message()
    
    cbopaque - an opaque pointer that will be passed to write_cb
    
    opts - an options string
  - nje_malloc_usable_size
```
public static long nje_malloc_usable_size(long ptr)
```
    Unsafe version of: malloc_usable_size
  - je_malloc_usable_size
```
public static long je_malloc_usable_size(java.nio.ByteBuffer ptr)
```
    Returns the usable size of the allocation pointed to by ptr. The return value may be larger than the size that was requested during allocation. The malloc_usable_size() function is not a mechanism for in-place realloc; rather it is provided solely as a tool for introspection purposes. Any discrepancy between the requested allocation size and the size reported by malloc_usable_size() should not be depended on, since such behavior is entirely implementation-dependent.
    
    Parameters:
    
    ptr - the allocated memory to query
  - MALLOCX_LG_ALIGN
```
public static int MALLOCX_LG_ALIGN(int la)
```
    Align the memory allocation to start at an address that is a multiple of (1 << la). This macro does not validate that la is within the valid range.
    
    Parameters:
    
    la - the alignment shift
  - MALLOCX_ALIGN
```
public static int MALLOCX_ALIGN(int a)
```
    Align the memory allocation to start at an address that is a multiple of a, where a is a power of two. This macro does not validate that a is a power of 2.
    
    Parameters:
    
    a - the alignment
  - MALLOCX_TCACHE
```
public static int MALLOCX_TCACHE(int tc)
```
    Use the thread-specific cache (tcache) specified by the identifier tc, which must have been acquired via the tcache.create mallctl. This macro does not validate that tc specifies a valid identifier.
    
    Parameters:
    
    tc - the thread-specific cache
  - MALLOCX_ARENA
```
public static int MALLOCX_ARENA(int a)
```
    Use the arena specified by the index a (and by necessity bypass the thread cache). This macro has no effect for huge regions, nor for regions that were allocated via an arena other than the one specified. This macro does not validate that a specifies an arena index in the valid range.
    
    Parameters:
    
    a - the arena index

Class JEmalloc

Nested Class Summary

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

MALLOCX_TCACHE_NONE

Method Detail

getLibrary

je_malloc_message

nje_malloc

je_malloc

nje_calloc

je_calloc

nje_posix_memalign

je_posix_memalign

nje_aligned_alloc

je_aligned_alloc

nje_realloc

je_realloc

nje_free

je_free

nje_mallocx

je_mallocx

nje_rallocx

je_rallocx

nje_xallocx

je_xallocx

nje_sallocx

je_sallocx

nje_dallocx

je_dallocx

nje_sdallocx

je_sdallocx

nje_nallocx

je_nallocx

nje_mallctl

je_mallctl

nje_mallctlnametomib

je_mallctlnametomib

nje_mallctlbymib

je_mallctlbymib

nje_malloc_stats_print

je_malloc_stats_print

nje_malloc_usable_size

je_malloc_usable_size

MALLOCX_LG_ALIGN

MALLOCX_ALIGN

MALLOCX_TCACHE

MALLOCX_ARENA