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single-threaded on-demand loading

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svn: r9022
This commit is contained in:
Matthew Flatt 2008-03-18 22:35:51 +00:00
parent d1fac38565
commit cc551fd2d0
1 changed files with 9 additions and 0 deletions
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9
src/mzscheme/src/read.c
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@ -5433,6 +5433,13 @@ Scheme_Object *scheme_load_delayed_code(int _which, Scheme_Load_Delay *_delay_in
port = delay_info->cached_port;
}
/* Allow only one thread at a time. This is a little questionable,
because unmarshalling could take arbitrarily long, and an
untrusted program might construct an adversarial bytecode. That
would be relatively difficult, though. In practice, unmarshalling
will be fast. */
scheme_start_atomic();
old_rp = delay_info->current_rp;
/* Create a port for reading: */
@ -5482,6 +5489,8 @@ Scheme_Object *scheme_load_delayed_code(int _which, Scheme_Load_Delay *_delay_in
clear_bytes_chain->clear_bytes_prev = delay_info;
clear_bytes_chain = delay_info;
}
scheme_end_atomic_no_swap();
if (v) {
delay_info->symtab[which] = v;