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Since signals aren't supported there and we need signals for some
of these tests.
Signed-off-by: Steve Bennett <steveb@workware.net.au>
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Quote the build dir or and the path to jimsh/tclsh
in the Makefile in case they contain spaces.
Also fix a few problems in tests/ that arise when the build
and/or source dir contain spaces.
Fixes #199
Signed-off-by: Steve Bennett <steveb@workware.net.au>
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In the case where interp is not supported
Signed-off-by: Steve Bennett <steveb@workware.net.au>
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Loadable modules and tests
Fixes #179
Signed-off-by: Steve Bennett <steveb@workware.net.au>
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Although the documentation has always stated that, like Tcl,
insertion order of dictionaries was preserved, this has never
been the case. Instead, dictionaries were implemented as simple
hash tables that did not preserve order.
Now, a new implementation of dictionaries preserves insertion
order and has a number of other benefits.
Instead of hashing keys and storing keys and values in the hash table,
the keys and values are not stored in a separate table, exactly as
lists are stored, with alternating key, value pairs. Iterating over the
dictionary is exactly like iterating over a list, where the order is consistent.
The hash table uses closed hashing rather than open hashing to avoid
allocatation of hash entry structures. Instead a fixed (but expandable)
hash table maps the key hash to the offset in the key/value table.
This use of offsets means that if the key/value table grows, the offsets
remain valid. Likewise, if the hash table needs to grow, the key, value table
remains unchanged.
In addition to the offset (which indexes to the value, and 0 means the hash table entry is unused),
the original hash is stored in the hash table. This reduces the need for object
comparisons on hash entry collisions.
The collision resolution algorithm is the same as that used by Python:
peturb >>= 5;
idx = (5 * idx + 1 + peturb) & dict->sizemask;
In order to reduce collisions, the hash table is expanded once it reaches
half full. This is more conservative that Python where the table is expanded
when it is two thirds full.
Note that if a hash collision occurs and then the original entry
that cased the hash collision is removed, we still need to continue
iterating when searching for the new key. Don't stop at the now-empty
slot. So these entries are marked with offset=-1 to indicate that
they need to be skipped.
In addition, the new faster hashing algorithm from Tcl 8.7 is used.
This the hash for integers to be calculated efficiently without requiring
them to be converted to string form first.
This implementation is modelled largely on the Python dict implementation.
Overall the performance should be an improvement over the current implementation,
whilst preserving order. Dictionary creating and insertion should be faster
as hash entries do not need to be allocated and resizing should be slightly faster.
Entry lookup should be about the same, except may be faster for pure integer keys.
Below are some indicative benchmarks.
OLD NEW
dict-create-1.1 Create empty dict 97.2ns .
dict-create-1.2 Create small dict 440ns -27%
dict-create-1.3 Create medium dict 1.54us -57%
dict-create-1.4 Create large dict (int keys) 130us -80%
dict-create-1.5 Create large dict (string keys) 143us -75%
dict-set-1.1 Replace existing item 258ns -34%
dict-set-1.2 Replace nonexistent item 365ns -49%
dict-exists-1.1 Find existing item 55.7ns -5%
dict-exists-1.2 Find nonexistent item 55.0ns -5%
Signed-off-by: Steve Bennett <steveb@workware.net.au>
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Because we use catch -exit { ... }, if a test uses os.fork
we will return in both the parent in the child. To fix this,
require the child to use exit 99, and detect this case and exit
from the child in this case.
Signed-off-by: Steve Bennett <steveb@workware.net.au>
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Signed-off-by: Steve Bennett <steveb@workware.net.au>
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Currently signals can only be delivered to a single interpreter.
To avoid confusion where currently this is the most recently created
interpreter, don't create the signal command and handle signals in child interpreters.
Signed-off-by: Steve Bennett <steveb@workware.net.au>
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The return code was the wrong sense.
Also, load 'interp' if possible.
Signed-off-by: Steve Bennett <steveb@workware.net.au>
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Signed-off-by: Steve Bennett <steveb@workware.net.au>
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