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git://sourceware.org/git/newlib-cygwin.git
synced 2025-01-18 20:39:33 +08:00
63b503916d
Rather than using malloc/free for the buffers, we're now using HeapAlloc/HeapFree on a HEAP_NO_SERIALIZE heap created for this thread. Advantages: - Less contention. Our malloc/free doesn't scale well in multithreaded scenarios - Even faster heap allocation by using a non serialized heap. - Internal, local, temporary data not cluttering the user heap. - Internal, local, temporary data not copied over to child process at fork(). Disadvantage: - A forked process has to start allocating temporary buffers from scratch. However, this should be alleviated by the fact that buffer allocation usually reaches its peak very early in process runtime, so the longer the proceess runs, the less buffers have to allocated, and, only few processes don't exec after fork anyway. Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
57 lines
1.5 KiB
C++
57 lines
1.5 KiB
C++
/* tls_pbuf.cc
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include <winsup.h>
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#include <malloc.h>
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#include "tls_pbuf.h"
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#define tls_pbuf _my_tls.locals.pathbufs
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void
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tls_pathbuf::create ()
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{
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tls_heap = HeapCreate (HEAP_NO_SERIALIZE | HEAP_GENERATE_EXCEPTIONS,
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NT_MAX_PATH * sizeof (WCHAR) * 10, /* 640K */
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NT_MAX_PATH * TP_NUM_C_BUFS /* 4.6M */
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+ NT_MAX_PATH * TP_NUM_W_BUFS * sizeof (WCHAR));
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}
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void
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tls_pathbuf::destroy ()
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{
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if (tls_heap)
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HeapDestroy (tls_heap);
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}
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char *
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tmp_pathbuf::c_get ()
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{
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if (!tls_pbuf.tls_heap)
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tls_pbuf.create ();
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if (tls_pbuf.c_cnt >= TP_NUM_C_BUFS)
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api_fatal ("Internal error: TP_NUM_C_BUFS too small: %u", TP_NUM_C_BUFS);
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if (!tls_pbuf.c_buf[tls_pbuf.c_cnt]
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&& !(tls_pbuf.c_buf[tls_pbuf.c_cnt]
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= (char *) HeapAlloc (tls_pbuf.tls_heap, 0, NT_MAX_PATH)))
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api_fatal ("Internal error: Out of memory for new path buf.");
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return tls_pbuf.c_buf[tls_pbuf.c_cnt++];
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}
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PWCHAR
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tmp_pathbuf::w_get ()
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{
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if (!tls_pbuf.tls_heap)
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tls_pbuf.create ();
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if (tls_pbuf.w_cnt >= TP_NUM_W_BUFS)
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api_fatal ("Internal error: TP_NUM_W_BUFS too small: %u.", TP_NUM_W_BUFS);
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if (!tls_pbuf.w_buf[tls_pbuf.w_cnt]
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&& !(tls_pbuf.w_buf[tls_pbuf.w_cnt]
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= (PWCHAR) HeapAlloc (tls_pbuf.tls_heap, 0,
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NT_MAX_PATH * sizeof (WCHAR))))
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api_fatal ("Internal error: Out of memory for new wide path buf.");
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return tls_pbuf.w_buf[tls_pbuf.w_cnt++];
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}
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