newlib-cygwin/winsup/cygwin/release/3.3.1

Bug Fixes
---------

- Fix a fix in 3.3.0 which broke Vista / Server 2008 by using a Windows
  function introduced with Windows 7 only, namely TryAcquireSRWLockExclusive.
  Addresses: https://cygwin.com/pipermail/cygwin/2021-October/249732.html
Cygwin: split malloc_init Cygwin 3.3 only: Replace SRWLOCK usage for malloc synchronization with the first incarnation of the patch splitting malloc_init into two parts. The SRWLOCK usage requires TryAcquireSRWLockExclusive, which isn't available on Vista / Server 2008, unfortunately. Per https://cygwin.com/pipermail/cygwin-developers/2021-October/012429.html, we may encounter a crash when starting multiple threads during process startup (here: fhandler_fifo::fixup_after_{fork,exec}) which in turn allocate memory via malloc. The problem is concurrent usage of malloc before the malloc muto has been initialized. To fix this issue, split malloc_init into malloc_init_0, called from dll_crt0_0, and malloc_init_1, called from dll_crt_0_1. malloc_init_0 just initializes the muto, malloc_init_1 checks for user space provided malloc. Signed-off-by: Corinna Vinschen <corinna@vinschen.de> 2021-10-26 18:03:28 +02:00			`Bug Fixes`
			`---------`

			`- Fix a fix in 3.3.0 which broke Vista / Server 2008 by using a Windows`
			`function introduced with Windows 7 only, namely TryAcquireSRWLockExclusive.`
			`Addresses: https://cygwin.com/pipermail/cygwin/2021-October/249732.html`