support for Windows multithreading

oc_meta/core/curator.py

@@ -176,9 +176,11 @@ def _collect_identifiers_with_progress(self, task_id=None):
             for i in range(0, total_rows, self.min_rows_parallel):
                 chunks.append(self.data[i : i + self.min_rows_parallel])
 
+            mp_method = "spawn" if os.name == "nt" else "forkserver"
+
             with ProcessPoolExecutor(
                 max_workers=self.workers,
-                mp_context=multiprocessing.get_context("forkserver"),
+                mp_context=multiprocessing.get_context(mp_method),
             ) as executor:
                 for chunk_metavals, chunk_ids, chunk_vvis in executor.map(
                     _extract_ids_from_chunk, chunks

oc_meta/lib/finder.py

@@ -5,6 +5,7 @@
 from __future__ import annotations
 
 import multiprocessing
+import os
 from concurrent.futures import ProcessPoolExecutor
 from functools import partial
 from typing import TYPE_CHECKING, Dict, List, Tuple, TypedDict
@@ -678,9 +679,10 @@ def process_batch_parallel(subjects, cur_depth, visited_subjects):
                     for i in range(0, len(batch_queries), queries_per_worker)
                 ]
                 worker = partial(execute_sparql_queries, ts_url)
+                mp_method = "spawn" if os.name == "nt" else "forkserver"
                 with ProcessPoolExecutor(
                     max_workers=min(len(query_groups), MAX_WORKERS),
-                    mp_context=multiprocessing.get_context("forkserver"),
+                    mp_context=multiprocessing.get_context(mp_method),
                 ) as executor:
                     grouped_results = list(executor.map(worker, query_groups))
                 results = [item for sublist in grouped_results for item in sublist]
@@ -795,9 +797,10 @@ def get_initial_subjects_from_identifiers(identifiers, progress_task=None):
                         sum(batch_sizes[i : i + QLEVER_QUERIES_PER_GROUP])
                     )
                 worker = partial(execute_sparql_queries, ts_url)
+                mp_method = "spawn" if os.name == "nt" else "forkserver"
                 with ProcessPoolExecutor(
                     max_workers=MAX_WORKERS,
-                    mp_context=multiprocessing.get_context("forkserver"),
+                    mp_context=multiprocessing.get_context(mp_method),
                 ) as executor:
                     results = []
                     for idx, grouped_result in enumerate(
@@ -973,9 +976,10 @@ def get_initial_subjects_from_vvis(vvis, progress_task=None):
                     vvi_count = int(total_vvis * len(group) / len(vvi_queries))
                     grouped_vvi_counts.append(max(1, vvi_count))
                 worker = partial(execute_sparql_queries, ts_url)
+                mp_method = "spawn" if os.name == "nt" else "forkserver"
                 with ProcessPoolExecutor(
                     max_workers=MAX_WORKERS,
-                    mp_context=multiprocessing.get_context("forkserver"),
+                    mp_context=multiprocessing.get_context(mp_method),
                 ) as executor:
                     results = []
                     for idx, grouped_result in enumerate(

oc_meta/lib/rdf_patch.py

@@ -22,7 +22,7 @@
 from oc_meta.lib.file_manager import find_rdf_file
 from oc_meta.run.meta.generate_csv import load_json_from_file
 
-_forkserver_context = multiprocessing.get_context("forkserver")
+mp_method = multiprocessing.get_context("forkserver") if os.name != "nt" else multiprocessing.get_context("spawn")
 
 HAS_IDENTIFIER = "http://purl.org/spar/datacite/hasIdentifier"
 USES_IDENTIFIER_SCHEME = "http://purl.org/spar/datacite/usesIdentifierScheme"
@@ -201,7 +201,7 @@ def load_available_entities(
     result = {}
     with ProcessPoolExecutor(
         max_workers=workers,
-        mp_context=_forkserver_context,
+        mp_context=mp_method,
     ) as executor:
         for partial in executor.map(_load_target_batch, batches(tasks, 24)):
             result.update(partial)

oc_meta/lib/sparql.py

@@ -5,6 +5,7 @@
 from __future__ import annotations
 
 import multiprocessing
+import os
 import time
 from concurrent.futures import ProcessPoolExecutor, as_completed
 from typing import Callable
@@ -131,9 +132,11 @@ def run_queries_parallel(
             query_groups.append(batch_queries[i : i + QLEVER_QUERIES_PER_GROUP])
             grouped_sizes.append(sum(batch_sizes[i : i + QLEVER_QUERIES_PER_GROUP]))
 
+        mp_method = "spawn" if os.name == "nt" else "forkserver"
+
         with ProcessPoolExecutor(
             max_workers=min(len(query_groups), workers),
-            mp_context=multiprocessing.get_context("forkserver"),
+            mp_context=multiprocessing.get_context(mp_method),
         ) as executor:
             future_to_size = {
                 executor.submit(

oc_meta/run/count/meta_entities.py

@@ -130,10 +130,11 @@ def count_venues_from_csv(self) -> int:
             task = progress.add_task(
                 "Counting venues from CSV files...", total=len(filepaths)
             )
+            mp_method = "spawn" if os.name == "nt" else "forkserver"
 
             # Use forkserver to avoid deadlocks when forking in a multi-threaded environment
             with ProcessPoolExecutor(
-                mp_context=multiprocessing.get_context("forkserver")
+                mp_context=multiprocessing.get_context(mp_method)
             ) as executor:
                 futures = {
                     executor.submit(_count_venues_in_file, fp): fp for fp in filepaths

oc_meta/run/count/triples.py

@@ -268,7 +268,7 @@ def process_files(
         task = progress.add_task(f"Counting {unit_name}", total=len(files))
 
         # Use forkserver to avoid deadlocks when forking in a multi-threaded environment
-        ctx = multiprocessing.get_context("forkserver")
+        ctx = multiprocessing.get_context("spawn") if os.name == "nt" else multiprocessing.get_context("forkserver")
         with ctx.Pool(processes=workers) as pool:
             for file_path, count, error in pool.imap_unordered(
                 worker_fn, files, chunksize=chunksize

oc_meta/run/find/duplicates.py

@@ -146,7 +146,7 @@ def process_identifier_chunk(
     entity_info: defaultdict[IdentifierKey, set[str]] = defaultdict(set)
 
     # Use forkserver to avoid deadlocks when forking in a multi-threaded environment.
-    ctx = mp.get_context("forkserver")
+    ctx = mp.get_context("spawn") if os.name == "nt" else mp.get_context("forkserver")
     with ctx.Pool(processes=mp.cpu_count()) as pool:
         results = pool.map(process_identifier_zip_file, zip_files_chunk)
 

oc_meta/run/find/hasnext_anomalies.py

@@ -309,7 +309,7 @@ def main() -> None:
     total_brs = 0
     all_anomalies: List[dict] = []
 
-    ctx = multiprocessing.get_context("forkserver")
+    ctx = multiprocessing.get_context("spawn") if os.name == "nt" else multiprocessing.get_context("forkserver")
     with ctx.Pool(
         args.workers,
         _init_worker,

oc_meta/run/find/merged_entities.py

@@ -137,8 +137,9 @@ def main():
     all_results: list[tuple[str, str]] = []
 
     # Use forkserver to avoid deadlocks when forking in a multi-threaded environment
+    mp_method = "spawn" if os.name == "nt" else "forkserver"
     with ProcessPoolExecutor(
-        max_workers=args.workers, mp_context=multiprocessing.get_context("forkserver")
+        max_workers=args.workers, mp_context=multiprocessing.get_context(mp_method)
     ) as executor:
         futures = {executor.submit(process_prov_file, f): f for f in prov_files}
 

oc_meta/run/infodir/_common.py

@@ -164,7 +164,7 @@ def bounded_process_map(
     if workers <= 0:
         raise ValueError("workers must be greater than zero")
     path_iterator = iter(paths)
-    context = multiprocessing.get_context("forkserver")
+    context = multiprocessing.get_context("spawn") if os.name == "nt" else multiprocessing.get_context("forkserver")
     pending: dict[Future[ResultType], str] = {}
     with ProcessPoolExecutor(max_workers=workers, mp_context=context) as executor:
         for path in islice(path_iterator, workers * 2):

oc_meta/run/merge/check_merged_brs_results.py

@@ -546,7 +546,7 @@ def main():
     csv_files = [f for f in os.listdir(args.csv_folder) if f.endswith(".csv")]
 
     # Use forkserver to avoid deadlocks when forking in a multi-threaded environment
-    ctx = multiprocessing.get_context("forkserver")
+    ctx = multiprocessing.get_context("spawn") if os.name == "nt" else multiprocessing.get_context("forkserver")
 
     # Process CSV files to gather tasks
     with ctx.Pool(processes=multiprocessing.cpu_count()) as pool:

oc_meta/run/merge/check_merged_ids_results.py

@@ -475,7 +475,7 @@ def main():
     csv_files = [f for f in os.listdir(args.csv_folder) if f.endswith(".csv")]
 
     # Use forkserver to avoid deadlocks when forking in a multi-threaded environment
-    ctx = multiprocessing.get_context("forkserver")
+    ctx = multiprocessing.get_context("spawn") if os.name == "nt" else multiprocessing.get_context("forkserver")
 
     # Process CSV files in parallel
     with ctx.Pool(processes=multiprocessing.cpu_count()) as pool:

oc_meta/run/merge/check_merged_ras_results.py

@@ -515,7 +515,7 @@ def main():
     csv_files = [f for f in os.listdir(args.csv_folder) if f.endswith(".csv")]
 
     # Use forkserver to avoid deadlocks when forking in a multi-threaded environment
-    ctx = multiprocessing.get_context("forkserver")
+    ctx = multiprocessing.get_context("spawn") if os.name == "nt" else multiprocessing.get_context("forkserver")
 
     # Process CSV files to gather tasks
     with ctx.Pool(processes=multiprocessing.cpu_count()) as pool:

oc_meta/run/meta/check_rdf_files.py

@@ -627,11 +627,12 @@ def main() -> None:
     index: Optional[dict[str, str]] = {} if args.input_csv else None
 
     console.print(f"Checking every row of {os.path.basename(args.csv)}...")
+    mp_method = "spawn" if os.name == "nt" else "forkserver"
     with ProcessPoolExecutor(
         max_workers=args.workers,
         initializer=_init_worker,
         initargs=config,
-        mp_context=multiprocessing.get_context("forkserver"),
+        mp_context=multiprocessing.get_context(mp_method),
     ) as pool:
         aggregated = _drive(
             pool,

oc_meta/run/meta/check_results.py

@@ -480,8 +480,9 @@ def on_id_batch(batch_size: int):
     prov_future = None
     prov_executor = None
     if total_omids > 0:
+        mp_method = "spawn" if os.name == "nt" else "forkserver"
         prov_executor = ProcessPoolExecutor(
-            max_workers=1, mp_context=multiprocessing.get_context("forkserver")
+            max_workers=1, mp_context=multiprocessing.get_context(mp_method)
         )
         prov_future = prov_executor.submit(
             check_provenance_existence,
@@ -510,9 +511,10 @@ def _apply_zip_results(zip_results: dict[str, tuple[bool, bool]]) -> None:
                 result.prov_graphs_missing += 1
 
     if zip_args and workers > 1:
+        mp_method = "spawn" if os.name == "nt" else "forkserver"
         with ProcessPoolExecutor(
             max_workers=min(len(zip_args), workers),
-            mp_context=multiprocessing.get_context("forkserver"),
+            mp_context=multiprocessing.get_context(mp_method),
         ) as executor:
             for future in as_completed(
                 {executor.submit(_check_zip_file, a): a for a in zip_args}

oc_meta/run/meta/generate_csv.py

@@ -636,7 +636,7 @@ def generate_csv(
     result_buffer = ResultBuffer(output_dir)
 
     # Use forkserver to avoid deadlocks when forking in a multi-threaded environment
-    ctx = multiprocessing.get_context("forkserver")
+    ctx = multiprocessing.get_context("spawn") if os.name == "nt" else multiprocessing.get_context("forkserver")
     with ctx.Pool(
         workers,
         _init_worker,

oc_meta/run/meta/preprocess_input.py

@@ -364,9 +364,10 @@ def main():  # pragma: no cover
         results: list[FileResult] = []
         with create_progress() as progress:
             task = progress.add_task("Filtering existing IDs", total=len(csv_files))
+            mp_method = "spawn" if os.name == "nt" else "forkserver"
             with ProcessPoolExecutor(
                 max_workers=args.workers,
-                mp_context=multiprocessing.get_context("forkserver"),
+                mp_context=multiprocessing.get_context(mp_method),
             ) as executor:
                 futures = {
                     executor.submit(
@@ -385,9 +386,10 @@ def main():  # pragma: no cover
         results = []
         with create_progress() as progress:
             task = progress.add_task("Reading CSV files", total=len(csv_files))
+            mp_method = "spawn" if os.name == "nt" else "forkserver"
             with ProcessPoolExecutor(
                 max_workers=args.workers,
-                mp_context=multiprocessing.get_context("forkserver"),
+                mp_context=multiprocessing.get_context(mp_method),
             ) as executor:
                 futures = {
                     executor.submit(collect_rows_from_file, f): f for f in csv_files

oc_meta/run/meta_process.py

@@ -351,7 +351,7 @@ def _upload_sparql_queries(self) -> None:
         # Use forkserver to avoid deadlocks when forking from a multi-threaded process.
         # Libraries like Redis and rdflib create background threads, and fork() would
         # copy locked mutexes into the child process, causing hangs.
-        ctx = multiprocessing.get_context("forkserver")
+        ctx = multiprocessing.get_context("spawn") if os.name == "nt" else multiprocessing.get_context("forkserver")
 
         data_process = ctx.Process(
             target=_upload_to_triplestore,
@@ -410,7 +410,7 @@ def _store_and_upload(
             # Use forkserver to avoid deadlocks when forking from a multi-threaded process.
             # Libraries like rdflib create background threads, and fork() would
             # copy locked mutexes into the child process, causing hangs.
-            ctx = multiprocessing.get_context("forkserver")
+            ctx = multiprocessing.get_context("spawn") if os.name == "nt" else multiprocessing.get_context("forkserver")
 
             data_store_process = ctx.Process(
                 target=_store_rdf_worker,

oc_meta/run/migration/rdf_to_nquads.py

@@ -113,7 +113,7 @@ def main() -> None:  # pragma: no cover
     )
 
     # Use forkserver to avoid deadlocks when forking in a multi-threaded environment
-    ctx = multiprocessing.get_context("forkserver")
+    ctx = multiprocessing.get_context("spawn") if os.name == "nt" else multiprocessing.get_context("forkserver")
     with ProcessPoolExecutor(max_workers=num_workers, mp_context=ctx) as executor:
         iterator = executor.map(task_func, zip_files)
 

oc_meta/run/migration/stream_nquads.py

@@ -8,6 +8,7 @@
 import argparse
 import gzip
 import multiprocessing
+import os
 import sys
 import zipfile
 from collections.abc import Iterable, Iterator
@@ -208,7 +209,7 @@ def main() -> None:  # pragma: no cover
         only_prov=args.mode == "prov",
     )
 
-    ctx = multiprocessing.get_context("forkserver")
+    ctx = multiprocessing.get_context("spawn") if os.name == "nt" else multiprocessing.get_context("forkserver")
     with ctx.Pool(processes=num_workers) as pool:
         if output_dir:
             output_dir.mkdir(parents=True, exist_ok=True)

oc_meta/run/patches/fix_dangling_ars.py

@@ -75,8 +75,8 @@
 _stop_requested = False
 _existing_roles: frozenset[str] = frozenset()
 _target_roles: frozenset[str] = frozenset()
-_fork_context = multiprocessing.get_context("fork")
-_forkserver_context = multiprocessing.get_context("forkserver")
+_fork_context = multiprocessing.get_context("fork") if os.name != "nt" else multiprocessing.get_context("spawn")
+_context = multiprocessing.get_context("forkserver") if os.name != "nt" else multiprocessing.get_context("spawn")
 
 
 @dataclass(frozen=True, slots=True)
@@ -311,7 +311,7 @@ def load_provenance_statuses(
     tasks = [(path, frozenset(targets)) for path, targets in targets_by_path.items()]
     statuses = {}
     with ProcessPoolExecutor(
-        max_workers=workers, mp_context=_forkserver_context
+        max_workers=workers, mp_context=_context
     ) as executor:
         for partial in executor.map(_provenance_status_batch, _batches(tasks, 24)):
             statuses.update(partial)

oc_meta/run/patches/fix_duplicate_part_of.py

@@ -473,7 +473,7 @@ def check_orphans(
         br_files[i : i + batch_size] for i in range(0, len(br_files), batch_size)
     ]
 
-    ctx = multiprocessing.get_context("forkserver")
+    ctx = multiprocessing.get_context("spawn") if os.name == "nt" else multiprocessing.get_context("forkserver")
     with create_progress() as progress:
         task = progress.add_task("Checking orphans", total=len(br_files))
         executor = ProcessPoolExecutor(

oc_meta/run/patches/fix_literal_datatypes.py

@@ -5,6 +5,7 @@
 from __future__ import annotations
 
 import argparse
+import os
 import signal
 import shutil
 import zipfile
@@ -195,10 +196,11 @@ def main() -> None:  # pragma: no cover
     ]
 
     # Use forkserver to avoid deadlocks when forking in a multi-threaded environment
+    mp_method = "spawn" if os.name == "nt" else "forkserver"
     executor = ProcessPoolExecutor(
         max_workers=args.workers,
         initializer=_worker_init,
-        mp_context=multiprocessing.get_context("forkserver"),
+        mp_context=multiprocessing.get_context(mp_method),
     )
     try:
         with create_progress() as progress:

oc_meta/run/patches/fix_misplaced_editor_ars.py

@@ -286,7 +286,7 @@ def find_misplaced_editor_ars(
     frbr_part_of: dict[str, list[str]] = {}
     content_ars: dict[str, set[str]] = {}
 
-    ctx = multiprocessing.get_context("forkserver")
+    ctx = multiprocessing.get_context("spawn") if os.name == "nt" else multiprocessing.get_context("forkserver")
 
     with create_progress() as progress:
         br_task = progress.add_task("Scanning BR files", total=len(br_files))