This version focuses on refactoring and automated testing, though it also includes some non-trivial heap profiling optimizations not mentioned below.

New features:

• Add the *allocx() API, which is a successor to the experimental *allocm() API. The *allocx() functions are slightly simpler to use because they have fewer parameters, they directly return the results of primary interest, and mallocx()/rallocx() avoid the strict aliasing pitfall that allocm()/rallocm() share with posix_memalign(). Note that *allocm() is slated for removal in the next non-bugfix release.
• Add support for LinuxThreads.

Bug fixes:

• Unless heap profiling is enabled, disable floating point code and don't link with libm. This, in combination with e.g. EXTRA_CFLAGS=-mno-sse on x64 systems, makes it possible to completely disable floating point register use. Some versions of glibc neglect to save/restore caller-saved floating point registers during dynamic lazy symbol loading, and the symbol loading code uses whatever malloc the application happens to have linked/loaded with, the result being potential floating point register corruption.
• Report ENOMEM rather than EINVAL if an OOM occurs during heap profiling backtrace creation in imemalign(). This bug impacted posix_memalign() and aligned_alloc().
• Fix a file descriptor leak in a prof_dump_maps() error path.
• Fix prof_dump() to close the dump file descriptor for all relevant error paths.
• Fix rallocm() to use the arena specified by the ALLOCM_ARENA(s) flag for allocation, not just deallocation.
• Fix a data race for large allocation stats counters.
• Fix a potential infinite loop during thread exit. This bug occurred on Solaris, and could affect other platforms with similar pthreads TSD implementations.
• Don't junk-fill reallocations unless usable size changes. This fixes a violation of the _allocx()/_allocm() semantics.
• Fix growing large reallocation to junk fill new space.
• Fix huge deallocation to junk fill when munmap is disabled.
• Change the default private namespace prefix from empty to je_, and change --with-private-namespace-prefix so that it prepends an additional prefix rather than replacing je_. This reduces the likelihood of applications which statically link jemalloc experiencing symbol name collisions.
• Add missing private namespace mangling (relevant when --with-private-namespace is specified).
• Add and use JEMALLOC_INLINE_C so that static inline functions are marked as static even for debug builds.
• Add a missing mutex unlock in a malloc_init_hard() error path. In practice this error path is never executed.
• Fix numerous bugs in malloc_strotumax() error handling/reporting. These bugs had no impact except for malformed inputs.
• Fix numerous bugs in malloc_snprintf(). These bugs were not exercised by existing calls, so they had no impact.