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Load (ice-9 binary-ports) from C in thread-safe way

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* libguile/r6rs-ports.c: Do the usual dance to load
make-custom-binary-input-port et al just once.
This commit is contained in:
Andy Wingo 2023-06-02 22:28:13 +02:00
parent 5af66570bb
commit 00e48eb16d
1 changed files with 31 additions and 6 deletions
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37
libguile/r6rs-ports.c
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@ -40,7 +40,9 @@
#include "strings.h"
#include "symbols.h"
#include "syscalls.h"
#include "threads.h"
#include "values.h"
#include "variable.h"
#include "vectors.h"
#include "version.h"
@ -771,11 +773,32 @@ initialize_bytevector_output_ports (void)
/* Custom ports. */
static SCM make_custom_binary_input_port_var;
static SCM make_custom_binary_output_port_var;
static SCM make_custom_binary_input_output_port_var;
static scm_i_pthread_once_t make_custom_binary_port_vars =
SCM_I_PTHREAD_ONCE_INIT;
static void
init_make_custom_binary_port_vars (void)
{
SCM mod = scm_c_resolve_module ("ice-9 binary-ports");
SCM iface = scm_module_public_interface (mod);
make_custom_binary_input_port_var =
scm_c_module_lookup (iface, "make-custom-binary-input-port");
make_custom_binary_output_port_var =
scm_c_module_lookup (iface, "make-custom-binary-output-port");
make_custom_binary_input_output_port_var =
scm_c_module_lookup (iface, "make-custom-binary-input/output-port");
}
SCM scm_make_custom_binary_input_port (SCM id, SCM read_proc,
SCM get_position_proc,
SCM set_position_proc, SCM close_proc) {
return scm_call_5 (scm_c_public_ref ("ice-9 binary-ports",
"make-custom-binary-input-port"),
scm_i_pthread_once (&make_custom_binary_port_vars,
init_make_custom_binary_port_vars);
return scm_call_5 (scm_variable_ref (make_custom_binary_input_port_var),
id, read_proc, get_position_proc, set_position_proc,
close_proc);
}
@ -783,8 +806,9 @@ SCM scm_make_custom_binary_input_port (SCM id, SCM read_proc,
SCM scm_make_custom_binary_output_port (SCM id, SCM write_proc,
SCM get_position_proc,
SCM set_position_proc, SCM close_proc) {
return scm_call_5 (scm_c_public_ref ("ice-9 binary-ports",
"make-custom-binary-output-port"),
scm_i_pthread_once (&make_custom_binary_port_vars,
init_make_custom_binary_port_vars);
return scm_call_5 (scm_variable_ref (make_custom_binary_output_port_var),
id, write_proc, get_position_proc, set_position_proc,
close_proc);
}
@ -794,8 +818,9 @@ SCM scm_make_custom_binary_input_output_port (SCM id, SCM read_proc,
SCM get_position_proc,
SCM set_position_proc,
SCM close_proc) {
return scm_call_6 (scm_c_public_ref ("ice-9 binary-ports",
"make-custom-binary-input/output-port"),
scm_i_pthread_once (&make_custom_binary_port_vars,
init_make_custom_binary_port_vars);
return scm_call_6 (scm_variable_ref (make_custom_binary_input_output_port_var),
id, read_proc, write_proc, get_position_proc,
set_position_proc, close_proc);
}